I got my Leap Motion controller delivered today ($80). The idea is to sense your hand position, and control the computer through gestures.
The installation is web-based--the user must download the installation software. It turned out that nothing worked, and I went to the support page. I consulted the log for the diagnostics, and the recommendation was to update my software. So it turned out that the installation page installs version 1.03, which didn't work on my machine. The update software button installs version 1.04, which does work.
Interesting device. I'm disappointed that their software is 32-bit. For a device like this, they really should have made a native 64-bit version so it would more efficiently use the computer resources.
Anyway, I have not yet tried it with Sonar. My wife just glared at me for buying another gadget, so I better learn how to use it. I will post again after I've spent a little time with it.