Just got done with my first Circuit Factory workout and it was really tough, really tough. I heard from a friend it was tough... basically all cardio back to back and of course circuit training, and it was. They really focus on core, legs, and of course cardio. The instructors really push you to give 100% and are not afraid to tell you when you are slacking off. It is located in al Quoze which it is not hard to find, just look at the map. The first class is free but you have to pay 40AED because they host their class in 24hr Fitness so you gotta pay those guys to get in. Then it is 60AED a class; so basically you pay a 100AED a class after your first class which I think is kind of expensive but I'm pretty sure they have package discount. Overall a great class and the hardest one I have done in Dubai so far.