My heel does have a little bit of sliding room, but not enough to make me return the shoes. I spend a considerable amount of time in front of the musicians Im listening to on these phones as I mix and it sounds as close to being on the podium as any set of phones I have tried. 6) Premium look7) Prestige brand8) Strong Retaining magnets, they will never fall out of the case9) Massively long duration on one charge (just short of 8 hours from my test)CONS:1) B&O are tight with the ear tips. I have smaller ankles than most people my size so I need more of an adjustable option. For work, I prefer the wider unisex fit of the Specialist and the vented sides because they work better with socks. I hope they do well. This product is cheaply made, and in addition to this I received a defective unit. I hope this helps anyone looking for some perspective on their potential purchase. They aren’t the most comfortable if you fall asleep in them and there is a flashing light when they are on that you will notice at night. This was purchased as a gift.