I had a pair similar to these a few years ago and loved them.  I needed another pair for exercise and thought the fabric would be great.  They are, BUT, I have a shallow heel and the elastic cuts into the back of my heel.  Also, I wear a size 10.  it is difficult to wear anything but very thin socks with this shoe.  I do not have a high arch so I don't like it that I have trouble zipping the zipper all the way to the top without a struggle.

I did not return them because I was trying to break them in wearing them around the house.  It hasn't worked yet, but I am hopeful.  I think a size 11 would have been better, if they came in that size.