Fitness works is known for their classes, so naturally, any class during after work hours is going to be packed to the brim. I really liked Tues night body flow until I was afraid I was going to run into people while stretching out my pose.
I've stuck to the cardio and weights on my own now because I like being on my own schedule. There are TVs with almost every cardio machine with an overhead projection of the class currently in progress. They play a pretty good selection of music and I can see people singing along.
I don't have kids, but they also have a kid's zone area, pool, and spa. I know nothing about the trainers except that they hog all the balance balls for their clients when they won't use it for another 10 mins, which is the only really big gripe I have. People are friendly and will try to greet me when I have my headphones on. Oh, and they have the nicest bathroom/dressing room I've ever seen in a gym!