My daughter is a marathon runner and said these approximate the biomechanics of running barefoot, which is better for your orthopedic health.  At first, I thought that I might have more pain, because there is less padding and thus, more impact.  But i think the toes and the arch (particularly the talus) come into more important function, and the mechanics might indeed be more "natural," because i am having less of my old-middle age joint pains, despite keeping up my walking intensity.

They fit well and are very comfortable.  I did buy a pair of sox with toes.  Without these, there are a couple of places that rub and chafe.  With sox, it's fine.  The colors are striking and attractive, but it will take me a while to get used to the shoe.  I have to say, now, that I look retarded in them.  Sorry--I mean intellectually challenged.