As many will know, the xbox elite controller and many other controllers that are on the market such as the new steam controller, have back buttons or paddles on the back of the controller for the idea you bind them to a button so you don't have to move your thumbs or whatever.
The question is: Do you use them and if you do, what games, and what are you using them for in games?
I have owned various different "high end" controllers and I have just recently bought the Steam controller and one of the features is the back buttons but I just have never ever ever used them.
EDIT: Lots and lots of people have said they bind them to either stick clicks for things like sprint and crouch or face buttons such as jump so that they can aim in things like shooters while jumping. The stick clicks I might look into implementing. I personally am a claw gripper so the face buttons are okay for me