I run about 20 miles a week and consider myself a medium paced runner.  Bought these to replace an old pair of New Balance and have absolutely nothing poor to say about them! They are extremely comfortable and respond quite well.  Additionally, I received my shoes, exchanged them for another size and had the replacement pair delivered all within a week?!  So kudos to the Amazon distributor I got these from.  PS: These do not run large nor small so be sure to order your true size.