i havent used force factor before but ive used/tried other preworkout NO's (nitrous oxides) before. jack3d, superpump, noxplode, 1mr. jack3d is by far the best, nothing really even comes close. you'll hit the gym feeling like a monster just make sure you hafta cycle off every once in a while so ur body doesn't build too much of a tolerance. these things all have creatine and tons of stimulants in them. id probably say force factor is more hype than anything else. if you want reviews and stuff take a look at bodybuilding.com