EDIT 9/20/2011: After three years my LinkStation is still whirring away like it did the day I bought it. Still works perfectly with no problems.
EDIT 1/29/2009: This thing just totally saved my data. My PC crashed over the weekend and wouldn't boot up even after I ran the Windows XP installer in Repair Mode. It just kept rebooting over and over. Fortunately I had backed up my Windows drive to the Linkstation and was able to restore it back to its original location, now everything works fine again! Totally worth the purchase price.
I've had my Link Station Pro Duo for a few weeks and I've found that it gets the job done that it was made to do: stores data over the network.
The NAS comes with two pieces of software:
Memeo backup - Absolute garbage. I let it run for two weeks straight and it never finished backing up my 52 gigabytes of data. It's also not capable of backing up open or locked files even though Windows has had Volume Shadow Copy to help with that in very version of since 2000, and there's Open File Manager for 2000. Compare that to Backup Genie (which I now use) which was able to backup all of my data in under three hours (I highly recommend Backup Genie, it's fairly priced and so easy to use, and FAST).
NAS Navigator - This software is pointless. For the life of me I can't figure out what it's good for. When you open it up, all it does is list all of the Buffalo products on your network. Why do I need to install a 128MB program to do this? And who's going to have more than a couple of consumer NAS devices on their network anyways?
Pros:
* Quiet and efficient.
* Saves a lot of power - auto powers on when my backups run, then shuts off when they're done automatically.
* Offers lots of backup options -- Choose RAID0, RAID1 or spanned disk.
* The case is rugged and heavy like a miniature PC.
* Data copied over the network achieves superb transfer rates.
* Runs Linux open source operating system.
* You can download the NAS software source and modify it to your liking then reflash the firmware with your new OS.
* Platform independant - works on any operating system.
Cons:
* Gods help you if you forget the web interface password. The reset procedure on Buffalo's website doesn't work. I forgot my password and had to keep guessing until I guessed it. Think upgrading the firmware will get you around that? Think again. You need the admin password to upgrade the firmware.
* Tech support hold times are regularly half an hour or more. I've never had to call but this is what all the customers I've read about have said on various forums. I hope I never have to call them.
* The web interface is clunky and cumbersome, doesn't use AJAX (hello it must be 1998 again) and often "forgets" the settings you input, requiring you to put them in several times before they "take."
* Web interface uses "GMT offset" instead of time zones, so unless you're in the military you'll probably have to look up your offset to set the time zone.
* The "access your files remotely via the web" is very confusing to setup and there are much more elegant, easier to use solutions available (Orb for example is much more suited to the tasks the "via the web" feature tries to do and fails miserably at).
* You pay for a terabyte of space but you get 916 GB of space because the operating system of the device is stored on the hard drive, and it's huge.
* There's a lot of extra whizz-bang features you don't need for backing up data that occupy a lot of hard drive space and you can't remove them (media server, print server, web access).
* Firmware updates are about 150 MB downloads and there's no unified update. If you have an earlier firmware version you have to download every 150 MB firmware update and install them sequentially with each update taking about 15 minutes to complete.