This was the first Cirque show that I saw, so it will always be the one I compare all others to. It's my favorite Cirque show, and I plan to see it many more times.
The first noticeable thing is the moving platform stage. The engineering to do this must have been a feat within itself.
Unlike other Cirque shows, this one is less abstract and more theatrical with a follow-able story.
My two favorite characters is the black guy (I would get his autograph if I could), and the young main villain (if you're into anime, he looks like Orochimaru).
On a final note, the live band is awesome. The music and sound score is the best.