I've been going to the Princeton Club for over a year and I like it there. I exclusively go to the east side location so this review is based entirely on my experiences there.
In general the place is kept pretty clean, with the exception of a leak that led to a flood or something a while ago that left the whole place smelling musty for a couple weeks. The locker rooms are decent with plenty of lockers available. The main workout area is set up with a mass of cardio machines and a weight lifting area surrounded by a 1/10 mi track. Nearly all the cardio machines have individual tvs on them and there is also pop music playing throughout the gym. I tend to run outside, so I haven't used the cardio equipment much. The weights area is pretty nice. I've never had to wait to long for a machine or free weights. I tend to use the free weights and haven't been intimidated by all the guys in the area which at first I was worried might happen. There is a little side weight room that has smaller barbell weights, benches, and a mat that tends to be used more by the ladies.
Upstairs there are several basketball courts (which can be converted to volleyball courts with a drop down net), a few raquetball courts, a cardio class room and a spin class room. I've taken several of the cardio classes. My favorite is the PACE class offered in the gym. It's more varied and demanding than any of the other classes I've taken and is attended by nearly as many guys as gals. My only complaint about the class is that it is only offered once a week. They don't offer a yoga class exactly, but they do offer some deep stretch classes that seem pretty similar to yoga just minus the meditation aspects. I've enjoyed the cardio kickboxing classes although they can get a bit repetitive. I only took a spin class once and I wasn't that impressed by it.
The pool is decent, but can sometimes get busy. Also they have water aerobics classes two nights a week that take for the pool for a few hours eliminating the time to do laps.
The owners do have a big christian bent to them which normally would turn me off to a place. They say they are open 24/7, but are closed for major christian holidays including the last easter.