Just completed the Marine Corps Marathon yesterday In the all black Cloud. I purchased the shoes at the Expo on Friday and ran the 26.2 miles on Sunday. I walked about 7 miles on Saturday the break them in a little. I never run marathons in a new pair of shoes but I can truly say that I was very happy that I did. I didn't have any pain or blisters. They were great. You have found a way of making a lightweight, flexible shoe that gives the best support. From now on, this will be my running shoe.