Hmmm....maybe things have improved since Christmas. There is a list of activities that can be done any time. The teen navigator says that they should just ask a counsellor and supplies will be available. In addition, there are scheduled activities/games, etc. The 2 rooms allow activities in one with quiet hanging out in the other. The furniture can be moved to allow a large floor space (unlike Common Grounds, where it was fixed). Yes, the atmosphere is different. It was intentionally put "out of the way" so that there would be a lot less of an issue with younger kids/families just dropping in. This was a problem in Common Grounds as it was just off the pool.
My DD was disappointed that the feature of coding the teen KTTW cards so that they were the only ones who could use the elevators to The Stack wasn't working. It was one of the features in the articles discussing The Stack.
I can't really comment on the music, although DD thought enough of it that she invited me up to hear one song. It seemed to be very current stuff. The party themes were things like sports, glow in the dark, tropical, pajama party, sweetheart dance (the night before valentine's day.) She was worried about the sweetheart theme, but the counsellors assured her that it meant she should just come and have a good time...no "sweetheart" required.