I've seen this show twice and it definitely ranks up there with "O" as one of Cirque's best shows! The stage is the most spectacular at this one. And without giving anything away, the "shadow" part is one of my favorite parts of the show. So artistic and beautiful.
Got discounted tix at Tix4Tonight. We paid $115/ticket as opposed to $150 from the box office. I really don't know how they figure the discounted pricing, but that's what we got. We went right before the show started to get our seats assigned, and it didn't seem to be a problem, we didn't end up with crappy seats or anything for waiting until the last minute.