I think Moon is alright. It has a lunar-space decor and lighting theme going for itself. The dance floor is small but accommodates everyone. Like everyone is saying, the view is hard to beat. When they open up the roof, it's cool drinking/dancing under the stars. People here are nice and I never had a long wait for a drink. Best of all, your entry is also good for Playboy, which is down stairs via escalator and Ghostbar. I think it may be good also at Rain, but haven't tried there yet. That's good value.
I say Moon is second tier, compare to the other heavyweights. If you never been it's worth going once.