Did someone try this tool on RX560 cards? With the custom bios i am getting 14.8 MHs  per card on eth/etc... What could this tool do?

Well, it's worthy enough for me. I got 48 x Zotac 1050Ti OC in mid october 2017, at a price of around 135$ a piece, with a 3 year warranty. It hashes around 14.9 mh/s per card on ETH only, and that isn't  bad for the price. I got lucky, so i got my ROI. It is still very profitable for me, with a power price of around 0.05$ per KW. But now at this prices and difficulty i don't know what to tell you, at this prices of crypto it would take a longer time for you to get your ROI...