One of the coolest experience bars in Vegas. Imagine having drinks inside a massive 4 story crystal chandelier---it really is that neat and worth a visit. There are a dozen or so bars within the Chandelier (a few on each level), each with a different menu and offering.
There is no queue or fee to enter, and although the Cosmopolitan was very crowded (it was Christmas weekend), I always found several free couches and tables. It's located in the heart of the casino (and on higher-levels) the restaurant/shopping section of the hotel---makes for great people watching!
The staff was very friendly and did not press you to buy drinks.