UPDATED 29-OCT-09
Ok, have now got to change the rating. Bought two of these - first one failed, though in fairness, was replaced promptly. The second box just stopped working periodically and needed to be restarted. Backups failed part way through leaving us exposed. Took the drives out and put into a different NAS box (Synology) and that has worked seamlessly.
I would no longer recommend this NAS device.
UPDATED 16-SEP-09
I have purchased two of these, and one has now stopped working altogether. Will try to update after repair.
ORIGINAL REVIEW
First time using a NAS drive and this worked well, with just one minor setup issue (see below). Added two 1.5T drives and they installed and were formatted easily. The whole setup was pretty straightforward with just one glitch - the wizard setup got stuck on asking for a new admin password. No matter what I entered it just stayed there. A quick look at the support site allowed me to login directly and bypass the wizard, and then used the web interface to complete the setup.
I also upgraded the firmware which is supposed to improve the performance.
It connected to the network seamlessly and is now readily attached by anyone on the network.
Did a quick transfer test with a large folder of photographs - 12 GBytes of photos with about 14,000 files took just over an hour to transfer, at a quoted rate of about 2.5 MB/Sec, which to me seems very good for a product of this price.
There are faster NAS drives out there but at a higher cost. I think this one is excellent value and more than adequate for my needs.
I can't comment on it's use as a media centre as I didn't enable that, and it's not what I wanted it for.