I bought a pair of these and 3 months later one of the heels got a flat. Walking in them was an issue as it made my foot unstable. Nike replaced them for free, but now a year later the replacement shoes have a flat too. I hardly wear these shoes in the Winter so they don't have a lot of use on them, except for the flat heel they are in great shape.  For the price of these shoes I expect them to not be such horrible quality. I've been a lifetime Nike customer and this makes me want to try a different brand.