I love the fit of the shoe and the built in tongue and it feels great when running. I'm not sure how long running shoes should last, but I can run about 6 months or 200-250 miles without shoes. Due to my running gate, the external healing wears off during this time. I should probably retire the shoe after about 150 miles due to worn healing. -- I've had this model for two years, this is the third pair I've bought.