Even though I don't like the Unity desktop one bit (or maybe I'm kinda' thankful for it since it helped me quit Ubuntu/Gnome for KDE) and I think that the Ubuntu for Phone interface is too complicated for everyday use (too many confusing swipes), I am very pleasently surprised by this tablet interface.
After having used iOS, Android and webOS on tablets, I've got to say this is the best tablet UI I've seen yet.