I tested it a few weeks ago. I liked it very much. Neat interface, 17mb memory footprint if you use uTox and good voice quality. The software is in early stages though and i think one will have to wait some more time for it being really usable. The basic features seem to work all right, but stuff like receiving friend requests when you are offline etc seem to require quite some work. Also skype is still unbeaten in filtering out any feedback loops if you are using speakers instead of a headphone.