i got the usb version today for my PS classic with autobleem/retroarch. Solid controller I need to remap/configure it for sega gameplay, the c and a buttons are reversed, still was able to get a 1 timer in almost imediately so much better than playing with the ps 1 controllers.
The Sega Genesis mini is on sale for 59 bucks, they are doing a bunch of interesting hacks on that system as well, I may grab it and have it as my dedicated hockey 94 game system. That system comes with 2 , 3 button controllers, almost pays for itself.