I just got this today and used it for the first time on the game I got with it, which was Mach Rider (5 screw, whoo).  It's an interesting controller and I'm hoping to have some fun with it on other games.  The red "button" on the D-pad is kinda weird, but I'm sure I'll get used to it.

I need to get a dogbone one sometime to fiddle with.

Any other folks like the NES Max?