Based on what I am seeing on my Z9 so far I am not that hopeful at this point it is going to ROI.  There must be some secret place everyone else is mining that is getting them great numbers.  So far I haven't seen it.  Just hoping it will keep earning like this for some time or there is no way to get ROI.  Bitmain tossing some crappy coupons at us was an insult.