Hey guys,
Just so you know, I received my miners 3 days ago, and have been trying to hash ever since. I think it may be a backplane PCB board issue, or a power issue. I doubt its the raspberry pi board or the Serial cable board underneath.
They do hash, and they are legit.
I may have a power issue, not allowing me to run more than 2 boards/3boards at a time. Also, I don't trust the backplane design into ARM but that's personal preference... But they are real miners...Heres my ghetto RIG setup.
http://s935.photobucket.com/user/Casiriah_Mine/media/0330142307_zps0b876226.jpg.html