O is one of the most exhilarating shows in Vegas. It's a very expensive production, the artists perform death-defying acts, and the whole show is just spectacular!
I'm personally more of a comedy person, and would prefer more jokes to glitzy acrobatics...but I genuinely enjoyed every bit of O. If comedy is your thing, you might enjoy Zumanity/Absinthe. But if you want to feel awestruck, then this is the show for you. I felt that O is more physically demanding the some of the other cirque productions and will gladly give my money to these performers!