I've had the Invisible Shoe Huarache Running Sandals for almost a month now and, in addition to many walks, I've worn them on four runs. Oddly, I've run in them once at home in Cochrane on the trails, once in Lachine, Quebec (a suburb of Montreal), Boston, and New York City. They're very well travelled shoes. :)
I absolutely love running in them. They are comfortable both with and without socks, depending on the temperature. I love the incredibly free feeling I have running in them. My feet can bend and move in whatever way they need to while running.
I could go on and on about how great they are for running shoes and how comfortable but I think I'll wait until my Living Barefoot review comes out in a just a few days. Until then, here's a picture of my custom-made by me huaraches and my black injinjis.