I love the Ghost Bar on New Year's, and when I am with a group of friends.  But I am not super fond of it when only in Vegas with my SO.  It is really loud and fairly small.  What I like about it on NYE, is that you can get a table reserved for the price of admission.  On a non-NYE night, it is not worth the bottle fee to hang out in Ghost Bar because it is too loud to talk.  But still, it is more sophisticated and the music doesn't suck as hard as some clubs.