People who say anything about not meeting ROI are ignorant. How can you comment on ROI when you have no idea what the cost of bitcoin will be next week, next month, etc.
mpark the proper way to factor ROI on any miner actually doesn't involve the conversion price of
BTC to some other random currency. If you pay X
BTC for a miner and in it's life it generates >X (plus costs) then the miner profited. If you buy a miner for 1
BTC when it's at say $500 and it makes .5
BTC but the coin doubles to $1k have you broken even? If you believe you have you are allowing yourself to be blinded.