After reading the reviews I expected something great, or at least a noticeable difference. I don't. After several marathon training runs I have the same muscle soreness afterward and also feel muscle soreness during the run at approximately the same point in time I have before. Also, I've found the fit isn't great. I'm 5-8 and 130 pounds and ordered size small. The knee diamond (support area) seems to slide down when I'm running. Far from being too tight, they're a bit too loose and seem slide down off my thighs. I can't pull them higher as the crotch bottoms out. These are not worth the price in my opinion.