Exactly, i´m a long term user of Repetier Host on WIN7 and WIN10 without problems caused by Repetier .
My Problems were caused to 99% by the guy sitting in front of my computer.
Anyway, Keep in mind RepetierHost , included Slicers and also Repetier Firmware are (still) for free.
Simplify3d is not and also does not fit everybody´s needs.