I've owned these shoes for a year now and they are the most durable dress shoes I've ever owned!  I have never polished them, just treat with silicone oil (Dow corning 200) and they still look like new.  I usually unevenly wear the heels down, but no wear seen with these so far.  I walk on snow and ice, and have never slipped.  Silly as it sounds, I shovel snow and take dog for a walk in them and they do not look the worst for wear.  I will definitely buy another pair