My experience was okay, nothing great and I found it to be a little overrated.
In early December 2012 I visited with friends for my birthday. We arrived around 10:30 or 11:00pm on a Saturday and the doorman wouldn't let us take in my birthday cupcakes but kept them at the door for me to pick up at the end of the night. There's some rule about not bringing in outside food, but I appreciated that he was friendly. Once inside, the staff were quick and a little harsh when trying to keep certain pathways and areas clear. I stopped walking when I was near coat check for less than a minute to take off my coat and was immediately told to keep moving.
Throughout the night there was a series of fights (oddly enough including the same people who probably should have been kicked out after the first fight) and the drinks (at least mine) were 80% ice. Other than that, the live band wasn't very good in terms of sound or musical range but they had good energy. Not sure if I'll be back anytime soon, but I hear brunch is amazing. Might give that a try.