i've used them all-V12, swole2,
satur8,
nitrous, and currently on no-explode. i think they all work, but my preference is
satur8. no-explode gives me more
energy, but the price is way too high. get
satur8 for around $26, use it 3 servings w/o days, and 2 servings non w/o days, and you'll experience the best pumps for the money IMO.