You do know these are obsolete now? I shut mine off about 6 weeks ago. But if you insist on running them, use Hashra's SD card image for rPi. It's foolproof and stable.
http://hashra.com/support/And don't try to mine SHA with them... strictly for Scrypt.
I wouldn't say that,low power consumption is their strongpoint
https://bitcointalk.org/index.php?topic=7216.msg8952780#msg8952780They require a lot of cables & can take up abit of space,but still are viable
I might get a bunch of them again....if the price is right
I used CGminer,I think 3.7.1 & it was stable,just had to plug em in one at a time after starting CGminer