I wore these sandals from May through August, 2012.  Yes, they are quite comfy on the feet.  HOWEVER, I sometimes experience lower back pain due to a bulging disk and a couple of back surgeries.  By the end of the summer, my back was killing me, and I never connected it to the shoes until mid-August.  I switched back to my Aravon shoes by New Balance, and my back pain went away immediately.  The FitFlops are attractive, and they do feel good on my feet.  However, if you experience any kind of back or hip pain, you may find that the height of the FitFlops is somehow placing your back/pelvis out of alignment.  If that is a problem, you may wish to try Aravon / New Balance.  My next foray into comfy shoes will be Finn Comfort, as soon as I save up the $200+ to buy a pair!