Bally's is great for a person who doesn't need personalized service when working out. The wait times for an instructor are long, but there are a lot of machines and a lot of things to do. The building is very well equipped and is two floors of machines. Parking can be a problem, but if you're willing to not be up front or wait for a space, this is the place for you.
The costs are good if you join during one of their specials--which is always going on. Just make sure that you get your money's worth and actually go!