I really love these shoes. I have gone on two 8.5 mile trail runs and have lowered my time each time. The first run was good but my feet chapped a little. The second run was alot better. I assume that the shoes are broke in better now. I really like how lite these shoes feel and the grip they have going up wet hills is great. I run on a bike trail through the woods. These shoes perform in all the conditions I come across ie; sand, mud, grass, up hill, down hill, rocks, and tree roots. I have not run in them on a paved surface as of now.