Been on AMP O2 XT for a week now and have never experienced a preworkout supplement like this. I have used just about every preworkout supplement around (NO2 Xplode, Pumptech, creatine etc.) and this blows each one of them away. I did an Mdrol cycle over this past summer and it took me out of the swing of things cause I had a rough time on the PCT, and couldn't get that urge to go back to the gym. AMP has me going and I dont want to miss a day--the mental focus, pumps Im getting the whole package. Great product Kaioken! I recommend it to all that need that extra umph to get to the gym.