I bought one of these from minersource and it gave me extreme grief getting it going. It is still falling short of rated hash but atleast i got it doing something half decent. Using the cgminer supplied by bitmain. Converted the driver to winusb. Modded power to a atx psu for more umph. Using this comand line in a bat file:

cgminer.exe --bmsc-options 115200:1 -o stratum+tcp://freicoin.us:4334 -u username -p password --bmsc-freq 0C82 --bmsc-voltage 0800