I love Cirque du Soleil shows. Aside from the many high-end restaurants along the Strip, the Cirque du Soleil shows are world-class. I've been to a number of shows in Las Vegas and one in Orlando, FL so KA is probably the second best show I've seen.
This is not a water show, but the stage is incredible. It's like the hydraulic stage was part of the cast rather than a platform for the artists to perform on. The storyline was a bit confusing but overall it was a great show.