I don't want to spoil your fun, but I heard performance was pretty underwhelming.
The muscle stuff supposedly works okay, but the brain wave stuff is quite unusable. Which was, as I might add, to be expected. The NIA doesn't scan regions of the brain, but receives the electromagnetic radiation emanating from all of it. It takes great efforts to consciously at least semi-control brain waves, so it's not really usable for input purposes unless the game's specifically designed (e.g. getting harder as you lose focus); it could be compared by wanting to map keyboard strokes to the average speed of your body's limbs. While running over slippery hilly landscape. In a storm. It's not like you won't get any response out of it, but it'll be seemingly random.
Mapping functions like "when I'm sleepy, I want to be the idiot with the rocket launcher" will most likely work, while "I want to jump when I think JUMP!" won't.
-huha