Saw this kooked-out thing online. It's called "The Avenger" (apologies to the movie). It is an external adapter for an Xbox controller (or PS3) that hooks levers and tension bands around/on your finger to better facilitate your pressing the buttons quickly and easily. It looks like something Sherlock Holmes would use to play Xbox. Amazing what add-on products get developed for something that has hundreds of millions of users around the world. I love using the wireless Xbox controller with many different MAME games, but I'm just not quite ready to try this thing. If you do, let me know how it is.
It does not come with a controller, that is sold separately.