I recently bought the Adizero XTs as I am running on a lot of sharp flint and the Vibram Fivefingers I run in are not up to the abuse. I moved from Brooks cascadia 6s to less drop as I found I was getting problems with my knees with the higher drop and have found the Adizeros to be really good to run in. Good all round grip, not quite as good on the road as the brooks or the vibrams but much better off road. Light, and fit my feet well. Only complaint about the Adizero is the blue and orange colour scheme.