I enjoyed Zumanity, although it was a little more "interactive" than I would have expected
My favorite is still O, by far. Have to say I didn't enjoy Ka, my opinion was that they relied too much on the stage and didn't invest enough time in the story or the human element. Kinda like a one trick pony. Although, the scene with the "Giant Hamster Wheel" guys (I won't ruin it for those who haven't seen)?? VERY cool!