I am a committed sandal wearer.  I'm the guy who even wears sandals in the winter because I find that cool my feet all the more effectively.  That said, I have owned almost every brand of higher-end sandals over the years.

I have also chronically suffered from lower back pain.  Now, having worn these Chacos six days a week for 2 months (I don't wear them to church on Sunday),MY LOWER BACK PAIN IS GONE!  I will never by another brand of sandals again, and I will probably save up the money to by a leather pair for dressier occasions - cause I'm reeaal classy.