I had worn them for a few short runs and they feel really good. It's weird, you can actually feel the ground under your feet through them, but they have enough support and motion control in the heel to keep my feet stable while I run and not let my arches fall. What I like most is how light they feel and how flexible they are in the front of the shoe. I ran an hour in them today, just to see if they would work for a long run. I felt terrific. At the end of the run I was running really fast (for me) as if I were finishing a race. It was a beautiful fall day for a run and I felt fantastic. I had a lot of nagging injury issues that had kept me from feeling really good while running and so far these shoes seem to be keeping them at bay.
I may have to buy a couple more pairs before the trend runs its course. I may have to start importing them from Japan if I still love them so much when they're not cool anymore.