For a gym that is set-up as a quick-access, low frills type of joint, I'm pretty impressed with what they offer here. This one is the largest of the AF's, and includes classes as well as the free-weight/nautilus/cardio rooms. The pricing isn't the cheapest, but, at this location, it's worth what you're paying.
Lisa Trainor, guru and overseer, is extremely active in promoting her location, her atmosphere and is obviously a user of the gym and not just a membership cruncher. She's a big part of why I'd recommend this location as a starting point to anyone in the local vicinity rather than the Princeton Expresses.