IMHO I am waiting for the halving before shelling out for a rack of these machines, It seems a waste spending 3btc on a item that is immediately going to half in productivity in less than 2 weeks.

After the halving tho, I will be interested in selling off the 12+ S7's and upgrading to all S9's. I would keep buying S7's but I am going to soon run out of power lol

regs alex