I'm an average marathon runner and triathlete and give these shoes an A+. I was hesitant to buy these as I wasn't sure if they would hold up for long distance. They felt amazingly light and comfortable on my short to medium tempo runs but wasn't sure if they would hold up for long distance. After trying most brands of shoes and after several marathons and two ironmans, these have felt the best. Light weight with plenty of support. Well worth the money and about to purchase my second pair.