I have always been a fan of Nike running shoes due to their quality construction. Unfortunately, this one doesn't make the grade. The heal wore through into the air-cell compartment causing it to go flat (rendering the shoe unusable).  This happened with less than 80 miles on the shoes (20 miles/week).  I will still use Nike running shoes, just not the air-cell variety.  2 stars for the enjoyable four weeks I did have them.  Very low impact.