I used it for a few hours. Very fun indeed, but not really ready for anything near prime time. The screens all have to be run like programs right now. The motion was laggy on an overclocked tp2, but not anywhere near as bad as I thought it would be. Really quite useable and fun to toy with.
Before you install it, make sure you disable sense or it'll probably freeze your phone on startup. It eats up battery a little and if you uninstall it, make sure to delete the .ink file from the startup folder before you turn sense back on.
Also, some of the components didn't uninstall so my volume control had a funny screen and certain things seemed to be stuck until I hard reset for a new rom. Play if you wish, but for an unregistered beta with much room to grow required,
I'd only use it on a "play" phone as a concept or just before a new rom flash. Wish I knew how he does those animated wallpapers though.