I've been to Chateau several times. When the rooftop is open, it has one of the best vibes of any club in Vegas. It gets a running head start, because it's on one of the nicest and friendliest properties on the strip.
While you're not going to get big name DJs and celebrities, what you are going to get is impeccable service. I'm not sure if there's anything worse than spending 20x retail price for a bottle of liquor and still being treated like a bum off the street like you are at some of their competitors. Here, if you spend your money and treat yourself lightly, they will treat you like gold in return.