I like the concept, but they just don't fit my feet. My foot is 10 inches long and 4 1/4 inches wide at the ball. These shoes are just too narrow at size 43. After wearing them for half of a plyometric workout, I tried the rest without and my feet were cramping from being so confined. I also tried a size 44 while practicing kata; they were long enough that I had to be careful not to slip my foot out.As far as the sole is concerned, I could get over the squishy feeling, but probably the rounded hump in the middle of the foot.