Jun 30, 2011 5:15 PM GMT
I've used N.O. Xplode, not a fan. I've used Jack 3D which I really liked and saw great results and awesome workouts. The GNC kept hounding me to try C4 and said everyone is switching to it. I am sure he was just trying to sell a product but I eventually decided to give it a try. It seems ok and I've had some great workouts but I feel like Jack 3D was better. Thoughts?