I have a problem with one of my feet (PLANTAR FASCIITIS) and I believe due to the arch and heal support in these sandals that the problem is relieved. It takes a bit of time to get used to the hardness of the sole, but I can walk around all day with these and don't feel the heal spur digging in. I do think that the narrow fit would have been a better fit for me, as had to put the straps to the tightest fitting.
After years of burning through cheap thongs, I decided to get some decent summer shoes. These fit the bit. Keep your feet breathing but am sturdy and comfortable. There is a bit of a wear in period. I am usually a 42 but got a 41 and the fit is good.
Loved the shoe, but was a bit too big. I am normally a 39 but the 39 was a bit too long for me. Knowing that the shoe stretches a bit with use I gave the 39s to a friend and ended up buying the 38 which was perfect.