I love these receivers and use them for both the NES and SNES, but with the Wii Classic controller instead of the 8bitdo controllers. One nice side effect of using the Classic controller with the NES is that X and Y are rapid fire, which saves me from having to pull out the Advantage for turbo action.
I really wish they would make one for the Genesis and the Turbo/PCE, as they really do work great.