Good shoes
I've owned these shoes for several weeks. They're reasonably comfortable, which was a concern that I had due to the radical design of the soles. The design of the soles causes you to contantly adjust your balance, reputedly strengthening your back muscles and improving your posture. The jury is still out on those points, and I'm not sure how long those kind of changes should take.
I do have a word of warning on these shoes that I haven't seen posted elsewhere, and this is important. Hold onto hand-rails when going down steps. If your foot lands on the curved middle part of the sole, it makes it much easier to lose your balance on the stairs. Going up stairs isn't a problem, as the toe part of the sole, which is the part that lands when going up steps, is similar to those of other shoes.
Good shoe overall.
