So far, it seems pretty good.
I installed a 1TB Samsung 7200 rpm drive, hooked up the power brick, hooked up the FW800 cable (included) to the MacMini Server, powered it up.
Made a single partition (GUID aka MacOS Extended).
It seems fine. TimeMachine sees it, but I haven't tried using it for backup yet (backups go on the 2nd internal drive.) It's been on about 3 minutes now. ;-) I'll report back if there are any issues.
Cheers,
Scott.