Have to agree, hands down N2KTS is the best I have used. Have it in Green Apple and Grape, and love both flavors! I have stuck to 1 scoop (and have tried as many as 3), but if you up it to 2 and 3 scoops (which is closer to the original formulation of the product), you get an incredible niacin flush, and pumps so strong you'd swear your skin would burst. At 6' 7" tall and 290lbs it was just TOO much for me. Best part about the product is that is you do not like it for any reason, there is a 100% money back guarantee from Needtobuildmuscle.com. You'll also find discount codes floating all around the boards here.