I LOVE these sandals. I bought both a 10 and an 11 (usually wear 10) and the 11 fit better. Now that they're broken in, I'm happy with the 11 but it is just a smidge loose. But nothing that bothers me.
They're very comfortable despite their minimal design. I actually wore these while visiting NYC for the day - walked 8.5 miles in them and my feet didn't hurt at the end of the day - I was very surprised!