I wore these shoes for about 3-4 hours slowly walking on vacation and the heel lifts (black rubbery part) is already worn down to the wood base.  Unreal!  I can get years and years of heavy wear on shoes without having any issues.  Since it was longer than 30 days, Amazon won't take them back so I contacted OTBT and they have been wonderful in resolving the issue.  I hope my new pair will be better as these shoes are adorable!