Normally I don't do reviews but I had to for these shoes. I only run on a treadmill at the gym. I had the older model 769 and they seemed fine but my feet began to ache. I realized I had over 460 miles on them. The 860 seems lighter & the sole is more sturdy. They seem to glide rather than pound the turning treadmill. I will definitely purchase another pair when I hit 300 miles next year.