I have been been a member at TruFusion for over a year and take 1-3 classes per week as I attend another gym in town. I have visited all three locations and the Downtown Summerlin location is the nicest facility in terms of the decor and rooms. I almost always take classes at the DS location since I also live in Summerlin.
The instructors I recommend taking in Summerlin are: David Mazany for Kettlebells / boxing and Kadie, Costin, Maria and Anita for Boot Camp / Pilates. The individuals I mentioned have a very good and consistent intensity level and keep a watchful eye on the students.
"Prime Time" hours are just like a normal gym. Classes on the weekdays from 6-8pm tend to fill fast so I would arrive 10-15 min before the class begins to insure a good spot on the floor.
The front desk staff is always friendly, greets their customers and there is an overall family feel at the Downtown Summerlin facility. The location is kept really clean and is an overall bernice boutique facility.