The miners look to be made well and the current one I have is hashing at almost 6.5Th.  The fact that these can be used on 110v power since they only use 900 watts or so is a bonus.  power requirements are 6x 6-pin PCIe power connectors (3 for each board) and my killawatt shows around 1000 watts, but you cant use my numbers as they only way I could power this with 110v (in order to use my killawatt) was to use 2 power supplies (1 for each hashing board).  So true power usage with 1 power supply should be closer to the 900 watts.