I used it on Bonk's Adventure and Revenge all the time to aid with spinning. I remember switching between the different speed settings on the fly. My opinion was pretty much that it was included with the original controllers, so encouraged, whereas on a SNES/Genesis it was an aftermarket feature only so really more of a cheat. I think I remember using the turbo with Dungeon Explorer, Cotton, Macross 2036 (not sure, my memory is weak but it may have been autofire) and probably some other shooters as well.