I preordered a few months ago some STU-U6 ASIC miners from StrongU. The manufacturer advertised specs at the time I ordered was 660 GH/s, with a power consumption of 1,300 Watts. Now they say that the machines they will deliver produces only 440 GH/s with a consumption of 2,200 Watts. With those specs the ASIC is unprofitable at 0.12 $/KWh. StrongU has not yet deliver the equipment, and I requested my money back, due to the changes in the specs. StrongU refuses to return the money and insists on delivering the unprofitable machine. A word of advice never buys anything from StrongU. They will take your money and send you whatever they want. Beware!