I can recommend this config - I run 4 x 250GB SATA WD's on 2 x Adaptec 2 chan controllers (2 x 2 disc RAID1 - the 4 chan controller is too expensive). The discs are in a 4 slot hot swap enclosure and I have a separate machine with another 3 250's to serve as backup off the main machine. Massive waste of space but I feel really safe (at least when I am not thinking about fire/theft/etc...)

Every product that I've ever bought from SonicBlue has been malformed and returned to sender.

The technology sounds cool, but I'll probably wait until it's available from another vendor.