Guys tell me tell me that I made the correct choice,I just bought 68 refurbished avalonminer 741 with 1 year warranty for 14000 euros,thats 510 th, so I paid 25 euros per TH,if I had gone with the S9i new with 3 months warranty,I would have bought with 14000 14 miners with a total of 196 TH which is 72 euro per TH.So I already have 110TH in the pool and I will reach 620 by the end of june,I hope i made the right choice.