I lived in Chandler for almost two years and used this gym almost daily. It is never that crowded, even on a Saturday morning or a later afternoon gym run. The machines sometimes aren't all working, but there is a maintenance guy there often. I like how the cycles are available in the empty aerobics room if there isn't a class going on. The weights and weight machines are pretty decent and again, not that crowded most of the time. The staff at this location are the friendliest (IMO) among the other 24 Hour Fitness locations in the valley. The front desk people are always saying hello and the manager is friendly too. Many of the Group X classes are a lot fun. I miss when the true yogi yoga instructor taught there. Her classes were amazing.
Some of the personal trainers I would never ask to purchase sessions from. One of them walks like he is too cool for school and I attended a boot camp led by some of the male trainers, and it became a competition between two of them on who could do ladders the fastest. The female trainers and some of the male trainers look competent and their training sessions don't look so cookie-cutter-like, as the rest of the trainers.
The location of this gym is not in the best area of the city, although decent. When I used to go here, I'd buy groceries at the WalMart there after.