@crush Yeah, I think Vilros was going for the original 6 button layout rather than the extra features Retro-bit did. The Retro-bit controllers are admittedly a nicer option as far as Genesis goes.
I think I'd prefer my 8bitDo SN30 pro for SNES and Playstation. But I plan to get this set for the NES and N64 options, and the rest can be used as controllers by friends/family. I've yet to decide what I want to do for Sega, but I may just get this one and get the Retro-bit when I have the luxury of extra game budget.