Seems pretty lousy. No one wants to hold their arm up in the air tracing out full letters of each word like that. It will get tired. They don't even let the de

Seems pretty lousy. No one wants to hold their arm up in the air tracing out full letters of each word like that. It will get tired. They don't even let the demo guy keep his elbow on the table, something you should generally do for any gesture input mechanism you are writing that takes a while, even if it means they will just be using a short arc of space. There are great uses for gesture tracking techniques. Heck, countless people love the various games out there that use motion control, and there's even more industrial use for 3D stuff and posing characters. This is not a great use.