The biggest problem with the leap that I have seen (there is one in my lab) is that it sees hands spread out evenly on the surface really well, and that's about

The biggest problem with the leap that I have seen (there is one in my lab) is that it sees hands spread out evenly on the surface really well, and that's about it. If you do a thumbs up gesture (or a rude gesture when it doesn't work), the fingers get occluded by the bottom of your hand. Think about you hands as five friends trying to play connect at the same time and you can imagine the kinds of occlusion problems you might face. Still, I, and probably others, like the leap. It's not useless. You just have to exploit it the right way, looking for natural interface design beyond a Tom Cruse movie. The biggest free air interaction problems are (1) making visible what the available gestures are, and (2) providing tangible or visible feedback. You don't get to see and feel the the interaction like you can with a keyboard or less digitally inclined tools.