I wear these shoes to work in a truck and trailer repair shop.  I am on concrete all day from 7-8 a.m. to 6-7 p.m.  This is my third pair of this shoe.  They last about a year which is pretty good when you consider walking on concrete.  After that my feet and knees start to hurt which I take as an indication that the shoes are wore out and the soles broke down.  I get a new pair and after a short break in period, no more aching feet and knees!!!!!