Bought size 8, black/blue, eight months ago, and wear every day for walking/running 40 minutes. Goes on quickly with shoe-horn. I'm 135#. Worst wear on sole is at rear outer corners with loss of 1/8" of rubber. Otherwise, lots of tread left.
I went up a 1/2 size (10.5 to 11) and even using a shoe horn, this shoe is difficult to put on. Once on the shoe looks and feels good but what a pain just to get to the pool. Speedo could have done better!!