I am not a big fan of shows or musicals, but everyone said we had to see a show when in Vegas, so we picked O because of all the hype.
Paid about $85 per ticket, which was a big discount. We were on the balcony on the side, so it was annoying to look to the left the whole time, but I suggest sitting up high so you can see into the water.
I did enjoy it, but I didn't get the storyline, which the usher told us that O is one of the few Cirque shows that has a storyline. He explained a bit before the show, but it still didn't flow that well.
The music was enjoyable, the acrobats were amazing, and it was fun overall, but it was a little too long for me and the seats (as everyone else has said) are reallly uncomfortable. Didn't help that I was completely exhausted from our few days in Vegas (it was our last night).
I'm glad I saw it because it was a memorable experience. If you like shows, especially Cirque, I'd say it's worth it; otherwise you may want to save your money.