I like this product. First you load the CD (I normally hate doing this because you get loads of software that you don't want) then plug the unit into your router. The software detects the drive and that's it.
We use XP so I used Windows Explorer to map a folder on the Buffalo to a drive letter, but I guess Vista will have something similar. So far so good. We've now got the regular C: hard disk, D: and E: for DVDs and N: for the network drive.
It gets better though: we have another desktop that has a wireless connection to the router and we have a laptop. No need to load any special software on these, I just used Windows Explorer to map the folder on the Buffalo to a drive letter so they can read/write to N: too. I put all my files into this folder so now I can get at them whichever computer I happen to be using (we have children so there's often competion for any particular computer.)
It gets even better: I tried the Memeo software but didn't like it and downloaded some free synchronisation software called Allway sync. I created a new folder on the buffalo, mapped this to a new drive letter (Z: to avoid confusion) and now all the PCs keep an up-to-date copy of all the documents that are on all our accounts on all the PCs on the Buffalo. So if a PC dies, we still have all the data, but just in regular files, not some massive backup file. The syncronisation takes a few seconds (after the very first one) not hours.
Even better: what if the Buffalo dies? Well we plugged a USB drive into the Buffalo and this can be seen as yet another drive by all the PCs on the network just by using Windows Explorer again to map the drive. Every few hours Allway sync syncronises the files between the Buffalo and the USB drive so everything that is on the Buffalo is automatically copied on to the USB drive; if either drive dies, we still have all our data.
All this runs quietly in the background and doesn't seem to slow down any of the computers significantly, but it's made our system much more flexible and taken away much of our concern about the loss of several years of photos and office files that have gradually built up.
There are other fancy features like internet access (haven't used it, scares me witless), a print server (don't need it, the printer is already network ready), permissions control (we're a family so we share), FTP server (?) and Apple stuff which some may find useful.
I should add that we're not particularly speed hungry - we mostly use Microsoft Office products and the internet (rarely for video) and no gaming so 500GB is a LOT of data for us. In the past 10 years we've only managed to accumulate 50Gbytes - but even this much would need several DVDs now, so backing up this way is far less labour intensive.
So in summary, this is a really useful item especially with the additonal USB drive, but I'd stay away from Memeo backup and use Allway sync instead.