I've dealt with them. They deliver fast but 35-40% of that chinese assembled hardware dies quickly. I personally know an example when such antminer just died 3 months after delivery and no support from bitmain whatsoever. and their current batch is due to deliver in december so there is some delay. So your choice, if Umbergs statements about ares and hashcoins are true then this may verywell be my next scrypt rig.