i think i bought these sandals one size too big, but i still love them. after living in flip flops for two years as a peace corps volunteer on a pacific island for two years and continuing to do so in grad school for another couple of years, i was a Reef fan. they were relatively durable and relatively comfortable... until i got into a pair of Chacos. i always loved the foot bed of Chaco sandals, but their straps always rubbed me raw; so i stopped wearing mine. when i saw they had flip flops, i bought a pair immediately. i'm a huge fan. like many other reviews have pointed out, my feet aren't as tired when i take them off at the end of the day. the flip flops don't fall off my feet when my feet get wet (like they do in Reefs). and i don't slip in when i wear them in the rain. the traction is great. also, the support is pretty good too - not a lot of soft cushion like with reefs, but much better support.
overall, i would recommend these to everyone, so long as they get the right size. i bought them a little big, but still love them and will wear them whenever i can!