"O" is fantabulous! I can't exactly remember where we sat, since it's been over a week. It was about six rows from the stage on the middle-right side.
Can't really complain about anything. Just don't forget to get the "O" slushy/cocktail along with some popcorn and a magical soda (with free refills). It really does complete the experience. The citrusy "O" slushy was my most memorable Vegas drink.