I wasn't sure about these shoes at first, because there wasn't as much support in the heel as my Asics 2160's.  However, these shoes have me returning to the form I had when I used to live by the beach and run barefoot on the semi-firm sand.  It's more natural for me to strike with the balls of my feet, and these shoes provide more support there.  My knee seems more comfortable.  So far, I'm happy!