My foot keeps slipping up and down near the heel, very slightly, while I walk. My heel doesn't feel securely joined to the shoe. After tying the shoe extremely tight, this problem is mitigated, but normal wear remains annoying. I have bought the New Balance's top of the line shoe for many years now and have been completely satisfied. I am not sure why this shoe is like this and it feel like it is all in my head. Upon comparison with previous models, this new model is only a quarter of an inch reduced here or there. I can't image the small changes to make any difference from previous models, but it does for me. The shoe design is flawless and I love how they made the bottom more resistant to decay by adding hard plastic and not the spongy plastic of previous models. It's likely this shoe could last many years. It is a gorgeous shoe!