Bought a monthly membership because I thought it might be a good way to meet people in the city who shared an interest in fitness. The classes don't exactly promote interaction and the instructors make that clear from Day 1.
I certainly got a good workout and couldn't feel half my limbs after the class but didn't end up renewing my membership. I also felt that the classes were extremely large considering the space available. Conveniently located if you live downtown though.