Those are nice, but how do you keep your feet from sliding out/off the back when you walk? Never could get that part down.
For instance look at this one. This is a great shoe.

If they just have a couple of small bands in front, or lots of strappy stuff I find they move and pinch.
David Tate makes a great sandal. He used to make one called "Band" that I bought six pairs of. It was like walking on a cloud. Unfortunately he discontinued it.