I think the crux is that they won't do analog controllers. That's probably a good thing, though. I like these PCB's because they don't change the feel of the original controllers. If you had to switch out the analog pots, I can't imagine that they would feel the same as the originals.
Personally, I wish that they would make Bluetooth PCB's for the original 3 button Genesis controllers.
But, yeah, I'm really enjoying playing my old consoles with original controls wirelessly.