They are great!
I am very picky about the comfort of flip-flops-I would never have thought I could wear them all over a theme park for an entire day. But I was able to wear the Crocs Athens at Kings Dominion all summer, and my feet were not hurting at the end of the day. Normally I would wear supportive athletic shoes, and even then my feet would hurt.
I like them even better than the clogs because they don't feel so big on me. I like the clogs, too, though. I will wear the clogs during my Jan trip to WDW when it cold enough to wear socks.