Seeing them on TV does them no justice.
I've seen Alegria, Nouvelle Experience, Mystere, and O. All were EXCELLENT. I personally like the music from earlier ones (Alegria, Saltimbanco, etc) than the newer ones but the technical aspects of O and mystere are astounding. I can't wait till the new ones come to town.
BTW, a very good friend of mine got contacted by one of their talent scouts and was offered a position. She declined though.

(She was one of the top ranked USA rhythmic gymnasts several years ago)