I pre-ordered one early and have been waiting for what seems like forever. Mine should be arriving in a day or so.
I have a lot lower expectation than Leap seems to be espousing - as an interesting and offbeat UI device fun for developing.
It's certainly not the next coming UI paradigm. There's been enough UI and human physiology research that would tell people that holding up ones arms to point to things on the screen is not a feasible method for interacting with a computer (Minority Report not withstanding).
I think Leap made a big mistake going from a hacker group making an interesting device to a world changing UI group. They can never sustain this business model.
I'll enjoy my Leap and show it off as an amazing idea of technology but I'm not holding my breath that this will replace a mouse or trackpad.