I really enjoyed this show. The characters really popped out in terms of other Cirques. I've watched O, LOVE, and Kooza at this point so I've gotten the idea that each Cirque has a unique flavor to it. I happen to like Ka's very much.
Ka is really CDS' version of a dramatic play/opera. That might not sit well with others who are expecting stunts left and right, because Ka's focus is on its storytelling. I love the music too, epic!
Overall I was very satisfied coming out of the show. I also would recommend reading the character bits before the show. I think not knowing that the twins were a girl/boy set really confused my friend...who spent the majority of the show looking for a brother set and didn't realize it until they coupled with the other characters.