Ran this for the 1st time last week after buying 1 serving sample to try. Excellent pre-workout with fantastic focus and mood elevation—nothing too heavy with great pumps, but I had a fantastic workout on it, and it has quite low caffeine compared to some pre-workouts, so you feel the 100g of 2-amino more despite that being a low dose. Also, I am now going to buy a full tub; that's the beauty of being able to buy samples first.