Packed...at all times. This place is SERIOUSLY so busy that I've actually driven to other locs instead and this is basically across the street.
That said, everything else is fine. Decent set-up, good machines, lots of free weights, steam room and hot box sauna, pool and hot tub. Locker rooms are mostly clean. Full line up of classes and a bit of a younger crowd, probably due to being somewhat close to ASU.