Wow, this shoe really caught my eye!  I wanted the black, but they were out of stock so I ordered the brown in both 7.5 and 8.  I had heel slippage in both, and my toes were completely squashed in the 7.5, so I spent some time walking around the house in the 8's.  The heel slippage was annoying.  The other problem was that the sole, being some kind of flexible material, squashed noticeably, so that looking in the mirror I did not have this nice silhouette that you see in the side view, but a rather flattened version of it.

I sent them both back.  Nice looks, but...not for me.