Very Good NAS
Bought this NAS after doing quite a bit of research. Settled on this one because of price, and features I could use. The NAS is currently setup in Raid 1 mode, and I use my own backup software SyncBack which schedules all backups. Every computer in the house has access to the "Shared" drive, even some Windows 98 machines with no problems. Power save feature is a big plus on this device. The NAS sits in a corner behind my desk so I can't ever hear the thing running except when it is awaken from power save and the hard drives spin up. I use two Western Digital 500GB GP (Green Power) hard drives and is connected to a D-Link 8-port "Green Ethernet" Gigabit switch.
So far this NAS has exceeded my expectations. Full DVD ripped movies play on network without lag, and file access is up to par with the internal Hard Drives on my PC as far as performance goes. I don't use the USB Printer Server because I have a standalone Linksys PrinterServer which works good as is.
Had a few hickups after setup but not the NAS' fault. There was a conflict with static IP address on the router. After all was corrected it has worked like a charm. Still haven't tried the FTP or DDNS for remote access but setup of free DDNS account with D-Link was very easy.
So far so good, highly recommend this product.

Best All-in-one NAS solution
I have tried numerous NAS solutions, including a DIY NAS and the Simpletech NAS; conducted research at various websites including smallnetbuilder and tomshardware; and surveyed other NAS owners. In the end, I bought the DLINK-323 NAS and supplied it with two 320GB SATA hard drives. In one word...."WOW". It worked seamlessly and without any problems. Best of all, it is gigabit Ethernet ~ this makes a huge impact for file transfers and video streaming (assuming you have a gigabit Ethernet network - which I do). I would definitely recommend it. It is a little pricey considering that you don't get any storage space, but you pay for what you get and this is definitely worth the extra money if you want to do it right the first time. It is quiet, able to power-down the hard drives when not in use, and stays cool. ITunes server, ftp server, and a variety of other options work well. It is very user friendly and configurable. 5 stars!

reasonably fast, hackable, but noisy, bugged
Good:
- fast (for a NAS)
- hackable, can run torrent, media server etc.
- clever case, easy to add a disk

Bad:
- Noisy - hard disk noise resonates in the case
- Will get very hot w/ 2 harddisks
- When I added a second harddisk, it said it would format the new one - it stated the model number so I am 100% sure of this - , and then proceeded to format the old one. D-Link support said "it seems you lost your data". Thanks!

Great NAS, Okay Media Server...BUT...
I originally wanted this product as a RAID NAS to backup my music and photos. Then I got a PS3 and thought it'd be a great bonus to use the media server component. Here's where it fares:

NAS:
This is great as a RAID NAS. I didn't want a whole computer running to act as a file sharing device. Obviously, you can do that, too. I didn't want a network attached device or external USB drive without RAID because I'm looking for the reliability of RAID (two drives that mirror each other so that if one fails the other still has your data). Many of the RAID NAS devices in this price range have one built in drive or some other mechanism where if a drive fails, you have to send it back to the manufacturer to replace the drive(s) and rebuild it. What's the point?!? I popped in two 500 gig deskstars in there and away it went.

MEDIASERVER:
I wanted to share the photos and music I put on the network with my PS3. Using the latest (1.04) firmware, I was able to set it up and have it running with 10 minutes. I could play files just fine. HOWEVER the media server built into the NAS would unreliably provide MP3 Tags. For instance, it would allow for a "Rock" folder, but not "Soul". On the PS3, they were just listed under "Other". If I copied those same "Soul" files via the NAS to the PS3 HD, or put them on a USB Drive, the PS3 read the tags fine, so it was obviously a problem with the mediaserver. To verify even futher, I used a mediaserver on my desktop with those same files, again, and the PS3 saw them and categorized them just fine.

So... If you want to share a few songs, play one album at a time, view one folder of photos at a time- this will be awesome out-of-box. If you want to rip 300 CDs to the NAS and play by genre, rating, year, etc... You're screwed! ...Or are you? The DNS-323 allows you access to it's guts (Linux) so you can actually install a GOOD mediaserver on your NAS. I installed Twonky (Aprox ) in about half an hour at most. You can find the info on the DNS-323 wiki. It's a lot easier and safer than it sounds.

So... all in all, this is a great device. Perfect RAID NAS. Okay Media Server (minus one star for that). But with the flexibility to install a good media server and other linux components like a web server.

Installation:
Piece of cake. Out of the box it had the 1.03 firmware. I updated that first- easy. Then I added the 2 drives- very easy. Then I logged in via the browser (I never installed the dlink software!)- easy. It asked me how I wanted to use the drives and then formatted them- easy. The PS3 automagically found the mediaserver- Super Easy! Figuring out why it didn't tag my music properly- Frustrating! Installing Telnet and a new MediaServer... Not bad if you have a clue about computers (FTP, and basic Linux).

Performance: Unsure. I'm using wireless right now and there seems to be a delay inbetween songs. It might be better wired, or maybe that's just a limitation of streaming from a separate device. Also, I've noticed multiple disconnects from my DSL. This almost never happened before (maybe once in 6 months). Right now my DSL modem is also the wired/wireless router- not the best option in performance.

Handy network storage and printing
I am a new user of the DNS-323, and I would say my tech experience is moderate. The unit was very easy to setup. I installed 2 x WD 500GB SATA hard drives (WD5000AAKS), which you add to the unit without using any tools or screws. They just slide in from the front and click. Removal is just as easy. The included setup CD made finding the DNS-323 on my home network painless and fast on all of my networked computers.

I did not (have not yet) set up any user groups or permissions, which means that all the computers attached to my network can access both drives and all the folders on the DNS-323. I can see why you would want to set groups and users to protect information, but for the moment, the no group/users way works for me.

Setting up the print server was the only thing that gave me a bit of an issue with my HP Photosmart D5160 printer. To resolve my slow printing/no printing problem, I did this:

1) Configured my DNS-323 with a static IP address and made note of it.
2) Connected my printer to my computer, install drivers etc and make sure it was working correctly. (ie: printing!)
3) Next I opened the printer properties, selected the PORTS tab, and ADD PORT for a new local port named: \\lp Click OK and exit. Make sure this is still your default printer.
4) Finally, I disconnected my printer from my computer and connected it to my DNS-323. Without any further adjustments, I was able to print as normal from my computer.

Overall, I like the DNS-323 very much for a shared storage/backup device that all the computers on my network can access. The network print server was also a selling point for me (so I was pleased to get it working properly!), as was the idea of being able to replace hard drives quickly and easily as they become full, thus extending the the life of the product. I have not tried the iTunes server or the media server, since I wanted the DNS-323 primarily as a BACKUP device and would rather not play with the data I store on it. But it does have that included function for those who wish to fully explore its capabilities.

Cheap Price, Cheap performance
I researched a lot of home NAS devices, and eventually decieded based on price. This unit was the cheapest, and had the funtionality I needed.
However, performance was very poor, probalby due to the low power CPU the unit has.

A unit like this would be great for storing backups, etc (items you dont use very often), but for music/video/sentralized storage, I'd NOT recommend this produnt.

Just what our busy home network needed!
I read alot of pretty negative reviews of the NAS 200 but decided to buy it anyway. My experience with this product has been entirely positive. I owned the earlier 'SLUG' model from Linksys and the NAS 200 is a massive improvement.

Many of the reviews talk about how slow the NAS 200 is at uploading/downloading. Personally I just don't notice it as a problem. In fact it seems pretty fast to me. My primary interest was to install a RAID 1 backup server with good FTP server access so I could easily get to my files while on the road. I dropped two 500 GB SATA drives into the unit and configured RAID 1 giving me around 450GB of storage with the comfort that if either drive fails, I can replace it and not lose any data.

The FTP server function seems to work well. I configured all the computers in the house to be able to easily connect to the NAS 200 through Windows Explorer and I setup the free (1 year) Dynamic DNS service so I can navigate to the NAS 200 from anywhere I can get internet access.

Note that getting access to the NAS from the internet will require you to configure internal "Port Forwarding" on your NAT home router. I think the unit comes with instructions for setting this up on the Linksys WRT54G. In any case, you will need to forward port 20 traffic. Make sure you understand how to setup 'strong' passwords or every nut on the the internet will gain access to your NAS 200!

Overall, I am very happy with this product. As some may have mentioned the cooling fans are a bit loud so you may want to find an out of the way corner where you have cat 5 internet cable access to your NAT where it can sit and "hum".

The one thing I felt this unit should have offered was a Print Server function on one of the two USB ports. It doesn't.

Bonus info 1: note that the NAS 200 does not support NTFS on the internal SATA drives. You can however add USB drives that are already formatted in NTFS and it will work fine.

Bonus info 2; you cannot control who gets access to the data on the USB drives. In effect when you add a USB drive it becomes 'Public' for all registered users to read/write.

Good buy - I would recommend!
I purchased this device to use the SATA hard drives from PC that I recently replaced. It works good, easy to install the hard drives, easy to setup as network drive on multiple PCs.

I now have a backup copy of all critical items from multiple PCs on the NAT device.

Cons:
Must format SATA drives, so any old data on hard drive is lost.

I can not get the device to be accessible from the internet. Maybe related to my Hughesnet service. I need to contact linksys for assistance.

Speed is limited by network connection speed. So seems slow compared to internal hard drive speed.

Plain and simply, it works great!
After inserting a 1TB Hitachi HD and installing the driver from the CD that came with it, I was up and running in 15 minutes flat. It works great, as described by the manufacturer. I own several other Linksys products and their consistant high quality and excellent Customer Service are just number one in my book. Basically, if I'm looking for any computer peripheral and Linksys makes it, I look no more.

Works with Linux (and Windows of course)
The Linksys NAS 200 does not come with NFS type file sharing support, a critical service for die hard Linux folks. The NAS 200 does however, have FTP services and CIFS services. Not a deal breaker at all.

The easy fix is to install SMBFS for your Linux distribution! For Debian folk its as easy as "sudo apt-get install smbfs"

Then follow the example shown for the mount command like so

"sudo mount -t cifs //nas200ipaddress/PUBLIC\ DISK /mnt/nas -o username=you"

(The old school smbmount mount type is buggy and was replaced by cifs over a year ago)

Linux folks could also use curlftpfs for ftp mounts. The performance I experienced was buggy with large file transfers causing me to have to drop back to a standard ftp client for large files and bulk transfers. The cifs mount worked fine in all cases.

I took advantage of free shipping with Amazon and also purchased two 160GB SATA drives for quick and easy installation. The web interface for the NAS 200 guided me through configuring these two dives as a RAID1 mirror with no trouble at all.

The NAS 200 also has a built in http service used for configuration of the device. Not documented well is that any web browser client may be used to also view the files stored on the device. This is a great feature! My son loves to look at all the digital pictures we have saved over the years and now can do so without the possibility of accidental deletion. The http service also worked great streaming video to VLC across our home's wifi network.

Just remember that any files you copy to the PUBLIC DISK share is read/write access for all defined users on the NAS 200. Your personal stuff should, of course, be saved in a share defined for your desired username. Just read the product manual for more info.

So... the NAS 200 was purchased with the intention of replaceing a very old Linux PC acting as our home's file storage server. The NAS 200 works great with our Linux and Windows PCs, file transfers seem snappy and are error free, video streams from the web interface without lost frames. Thanks Linksys!