Integration with NT is seamless. The standard NT backup routines work well with it. Compression is via hardware inside the drive. The are a few things to be careful of however. No one tells you this.
Documentation is sparse but adequate.
One of the disk drives here is a Seagate Barracuda with 4GB of space using a wide SCSI interface. The drive is very fast. It does run hot but so far hasn't died. It is even nicer than the Seagate. It seems to run cooler and with less noise.