I'm on my fourth pair of Crocs Athens.  (Do DOT confuse these with the Athens Duet which is an inferior sandal).  I'm a heavier guy so it's not easy for me to find a comfortable pair of sandals and these are by far the best I've ever tried.  The only major flaw in the Crocs Athens is that they will remain comfortable to wear long after the tread wears out - which can be just a few months depending how often their worn.  After this happens, they will be treacherously slippery on a wet floor.