I bought these sandals 2 weeks ago. When they arrived I walked around my house in them. When you walk in them it digs into your ankles and causes pain. I had to put bandaids on them. They are very soar and red on the back of my ankles. However if you were to wear these without a ankle strap in the back I would say there is a close to perfect comfort.
Perhaps they can put a cushion in the ankle strap or use a softer material if they decide to revamp these.