Would give 5 but I think the story was slow in some parts and I was tired from a long day of exploring the strip, so I caught myself wanting to nod off. The man sitting behind me actually did! I think the best part of the show was about the last 40 minutes or so when the action and acrobatics really pick up. The stage is like a character in and of itself and is amazing.
We did choose to see Ka because our first choices were unavailable during the time frame we'd be in town. I'm glad I did see it because I'm a huge Cirque fan. Much better than La Reve.