In my opinion it's no better than a touchscreen because you have to wave your hands in the air which is more work than keeping it on a desk. I wouldn't buy it.
I think Leap still has huge potential (mainly commercial) but unfortunately not as a general purpose UI device. In fact, it's much worse than a touchscreen for all 2-D situations (ie, pretty much everything that's being represented on a flat screen).
In my opinion it's no better than a touchscreen because you have to wave your hands in the air which is more work than keeping it on a desk. I wouldn't buy it.