I'm a big fan of Orthaheel/Vionic.  I have a variety of shoes from them.  I was really hoping this one would work out for me.  It's a great looking shoe.  The foot bed itself is fantastic.  If I was rating the looks or the foot bed, I would have given it 5 stars.  The problem, like others have stated, is that the shoe slides off your heel with each and every step.  This seems to be a design flaw.  A little design tweak and this could be a fantastic shoe.  Hopefully, they'll redesign this model.  If they do, I'll absolutely try it again.