Was at Cosmopolitan for a conference and we had an event here, so I'm reviewing this from that perspective, but I had a great time! The space is nice and the outside part has a terrific view. It's comfortable and there are lots of different seating areas.
The best part was the DJ! I go to the same conference every year and there is usually dancing but I never saw so many people dance for so long as I did at this event. He was seriously skilled at getting everyone, no matter age, gender, race or religion out on the dance floor. His mixes were terrific and made you eager to hear what he'd play next. I am not a dancing guy but I was out on the floor for over an hour!
The part I wasn't crazy about was after I ran out of drink tickets, I had to buy my own beer and dropped $11 for a bottle of Stella! (Plus a tip). Honestly, I was offended by having to pay that much for such a mediocre beer.
Aside from that, it's a cool place!