Excellent pre-workout. I feel the tingling 20 minutes after drinking. It have a great workout. My only complaint is that there was damage to the top cover prior to receiving it. So had a big crack so whenever it moved around or transport it in my bag produst would spill out the top. I had to put in a plastic bag and keep it upright at all times. Other than that great product. My issue is more quality control in the packaging.