I doubt any multi-miner which automatically switch altcoins to btc on small portions will be efficient with current btc fees......for example today, I needed 200USD cash out from my exodus btc wallet and been asket 45usd transfer fees ------->>>>>> tahts insane!!
with those multi-miners you can switch your altcoins to any coins of your choosing, i am currently switching my mined coins to ethereum. your answer does not really answer my question though, have you used any of these multiminers?