Update:  After wearing these shoes for less than a month, they are already causing my heel to hurt after running short distances.  We ran 200m sprints (between lifts) yesterday, and I can barely walk today.  I'm tossing these shoes and searching for a pair of my old Nikes.    After wearing these shoes in several crossfit classes, I really like them.  If I had been in a store, I probably would have gone down a half size, they are a little long.