I have had the DS207 (the last two digits signify the year model) for nearly four years now and I have been delighted with it. Now looking into getting a 211 version and quite fancy the 211+. Write performance is a BIG factor when backing up multi hundred gigabytes worth of files, trust me. The 207 is sloooowwwww (7 Mbytes/sec

) in this department and the 211+ has 100Mbyte plus performance.
I would be interested to know of your experiences with the 211 and the 211j versions (as opposed to the 211+) and what you think of the write performance - personally I reckon these will be too slow to back up your PC on a regular basis - unless your PC is on 24x7 in which case it wouldn't matter.
Steve