I've been a fan of these shoes for a few years now. About to start my third pair. I get at least a year of life out of each pair so far. I used to run in a Nike shoes and then strapped these on my feet. Rocky trails became smooth and asphalt and hardpack became soft. They even performed solidly on the 22+ mile day hike up Mt. Whitney. My biggest fear with these shoes is that they will stop production of them.