tried SuperPump....liked it but can't say if it worked or not...I will say that the ritual of taking it made me want to work out......supplements don't really work and most claims are dubious...but if I was going to trust anyone it would be Gaspari....
The fact is that most supplement makers sel you these products because they want you to get into the ritual of taking them...if you take superpump before working out, it increases the likelihood that you will ACTALLY work out and not skip workouts and it increases your focus to workout harder in the gym
in other words, psychologically, because u have invested so much money into the supplements, you have a vested interest in making it work (so you don't feel like a jerk who wasted his money on something that is bogus)..therefore you are actually working out to make the supplement work instead of taking the supplement to make your exercise work...
sorry to burst you guys bubble...hope this helps.