it worked great for me for a while but now I take Mr. Hyde from pro supps. the best stuff in the world. specially if your looking for an extreme hardcore workout.! I will only buy c4 when I run out of Hyde lol
not big into prewo stuff anymore since the dmaa ban, but angel dust by blackstone labs is the really good. Not too over stimulating, but enough to motivate you on those days you rather just go home and chill after work.