I used like 10 sample packets I got from the olympia and MAYBE got 1-2 extra reps on some lifts.
The taste of the powder is god awful, worse than any other supplement I've ever tried. I'd drink Read4War all day before drinking Gakic.
The stuff is ridiculously expensive and does not live up the claims on the label...just a gimmick and a waste of cash you could spend on like 10lbs. on quality protein.