I like that it's a functional, inexpensive and detachable alternative to expensive controllers. It's amazing to be able to use them for first person shooters and then remove them for slower gameplay. The most efficient and inexpensive alternative to an expensive controller that I have found so far. There are cheaper controllers with paddles built in, but the ones I've tried or seen in reviews have cheap builds, and some just seem to have intolerable input lag. They can be used on OEM double whammy controllers and will work fine. Would buy them again.