For me, it's a great device, sure it's a SAN, but it can be used as a NAS if you want... i installed it on our server (Win2K SBS) and shared it as a drive, then all clients (Mac OS X, XP, Win 2k) map the drive as you would a NAS and voila... it's fast, reliable (so far) the mirrored drive has an advantage from an integrity point of view.

The biggest plus point for me however, was that as it appears as a physical drive on the server, i can back it up using Backup Exec without needing an expensive storage system with an embedded OS and a client for BE installed on it.

For the cost of approx £200 to buy the unit and 2 Seagate 500Gb SATA II drives it's a bargain IMO