Came in last night. Very nice! Comfortable, although toe loop will take a little getting used to...much better feeling than the thong of flip flops. There is a about an 1/8 of cushioning which is nice for walking and heel strike, compared to the sprints the which have no impact protection at heel strike. If you look down the foot bed there is the slightest arch but my flat feet don't notice it. No heel rise and soles are 10mm thick. When looking at them in hand there is a slight toe spring but with weight it is not noticeable. Plenty of gripping at toe off and wide enough for splaying.
Have done some light running and can say they are pretty nice, love the open feel.