This seems like a rock solid product. The taste was good. It mixed easy. I got no digestive issues from this. Focus and intensity were noticeably higher. Ears and face would start tingling, the it's on. Pumps were great. High volume workouts were a pleasure after taking this. If you go to the gym and sissy foot around, don't buy any. If you want a rock solid preworkout that does what it says it will do, go beast mode on that azz.