I've been a member of this gym for a couple years now and I think it's great. For the record, I only go to the gym for classes - I don't use exercise equipment, lift weights, or play raquetball. Once in a very long while, I'll get myself into the pool.
My opinion is that their classes are wonderful. The ones I want to take (Zumba and Kickboxing) are offered right after work. They offer a lot of BodyPump too - if that's your thing. All the instructors are super nice and enthusiastic. The locker rooms are always clean and tidy.
The pool is small - three lanes, not quite 25 yards and shallow. But it's fine for swimming laps, you just have to do the distance calculation appropriately.
Parking is usually good in the warmer months. Gets to be a little bit of a pain in the winter, but that's probably true of all gyms in Wisconsin.