Model A is very restrictive than the B, if you are even slightly serious to do sth of little weight with it. I wonder if A can withstand always-on torrent and/or a connected hard disk which is constantly filled by CrashPlan or Time Machine. One USB port is another big restriction. Kills my idea of making it work with two hard disk(without using a hub).

PS. It hurts to think that I am not buying it(B) because it costs ~$60 here(IN) and the original price being $35. Maybe I would have bought it if it was released for $60 and available here for the same cost. Played with it at a friend's place though.