The variety in the workout, working out with others, the motivation provided, and for some of the teachers, having the knowledge to help me modify my workouts due to physical limitations and then monitoring me during the workout.
I like the constant interval training. I would like to see more various free weight options. When I am at a station, I don't always have the right free weights to use. And when I ask if I can use weight from another station, they respond by saying that they are using it.
Unlike a global gym, you don't have to plan your own workouts, they are done for you. Everyone can go at their own pace and no one is competing against each other; The workouts are challenging but doable and modifications are available if needed; the coaches are motivating and the music is great.