Initially I was searching for a device to put my external USB HDD in a network. Was really tired of having access only from one computer. Since the seller guys are i-diots most of the time, in two or three places they didn't know to point me somewhere. So I decided to go for a real NAS (I didn't even know this acronym existed). Got the DNS323 because it was cheap (150 CAD actually) and people liked it a lot online. I noticed also those hacks, which made me understand people have experience with it.
It works ok, but this is the only NAS I've had. If I would change it for something 3 times faster (with a torrent client) I would do it immediately for $100. This said, my setup was not that cheap. 150 NAS + 99 x 2 1TB HDD = $350 + TAX = $395
Add the CAT6 cables + one ASUS Gigabit Switch, totalling about $450 anyway...
And the funny thing is that now I found the devices I wanted initially for USB HHD in network (some toy from Patriot for $50). I didn't go back anyway. A NAS is a computer, you can park stuff there, access via ftp, automatic backups of specific folders (i.e. only family fotos), etc. Somebody suggested to use an old computer and park it somewhere in the house. I don't think its nice and proper, beside the fact that power consumption would be higher. But this depends on the ratio between technology attitude and economy/design.
P.s. What I really don't like of DNS-323 is that it doesnt connect really to an external USB. You can use the shareport utility and fake a connection to you computer but this doesn't work well. A NAS without at least two USB ports for external HDD is not a good solution (nearly all of us have extrnal HDD which may like to be together with the rest of the storage).