I bought a pair of these Vapor 10 mens running shoes after being recommended them by a friend. I tried a pair on in a running shop and had a gait analysis done whilst there. I have flat feet and overpronate which over time has led to me having bad knee pain (especially when trying to run or going up or down stairs). I've been wearing these now for a few weeks and already I can feel my leg muscles strengthening and keeping my knee in place. For that reason I am prepared to say that these trainers could well save my life in the long run (and get me back into running again). Comfortable, light and affordable too. Five stars!