whoa.. VFF breaks in to CS also! Woohooo!!! in the TNF100 las oct i saw quite a number of participants using them for the 50km route, which was super demanding.. but the idea of landing with the ball of the foot will ease of knee pain as landing this way will force your calves muscles to act as shock absorber instead of the force going straight from the heels to the knees (heel landing relies completely on the mercy of the shoe heel cushioning).. and actually, cushioning in shoes "eats" some of the propelling energy we exert, so makes running less effective compared to barefoot.. these minimalist shoes have been in the uprising as runners nowadays find more benefits using them than relying on artificial cushioning, which makes the muscles "lazy".. the Tarahumaras (which are great ultra runners) inspire the design iirc.. and for those who wants to know the feeling, it is like running barefoot on grass field, at least that is what some of the TNF runners told me.. i wanted to buy a pair, but find it too expensive here compare to outside.. after you break in to the shoes, you can practically take it anywhere, walking or running..