LA Fitness is definitely good for what you're paying for (as a student, I pay only $40/month, and I think most people pay only $50). It is clean and spacious, with tons of weights and machines - even at peak times I always find a cardio machine available. When you sign up, they offer you a free personal training session. The locker rooms are fairly modern and well-kept, and there is also a jacuzzi for relaxing after a workout. The gym has floor-to-ceiling windows that look out onto Wilshire Blvd, which can be a bit unnerving (like a fishbowl) but you learn to ignore it. I love that , unlike some gyms, LA Fitness never gets too hot inside - they definitely control the temperature well. The crowd is fairly young and fit, but it's not at all intimidating. I would recommend this gym if you're living in Westwood and can't afford Equinox. Also, they have their own parking structure.
Pros: relaxed environment, spacious, good selection of machines
Cons: can get overly crowded, no personal TVs on equipment