Thank you for bringing this point up, this is a mistake that many people do, perhaps most of us has done a similar mistake, it's best to buy miners that use the same PSU and preferably the same control board, doing so allows you to have a spare of everything at a very low cost, buying say S17, T17e, Whatsminer M21s, and an S9, means you need 4 spares of PSUs and control boards, buying the same gear model you will need only 1 PSU and 1 Control board, in many cases, you might not end up using the spare because before the PSU or the control board goes bad, a few hash boards will die and then you end up with more spares.



At $66 for that gear, I would be very interested myself, I think OP should go for it, the price is very decent compared to today's prices.