these things are incredible and I defiantly recommend buying them. 2 things to note:

1 the chiba does not have holes for ventilation so your feet might get a bit toasty / sweaty - mine do
2 the bottom is made of the softer flipflop material.  I've had my pair for a couple of months now and i'm starting to really wear through them pretty fast. I don't expect them to last more than a year or two if you do a moderate amount of walking.

Pros. I took a 10 mile walk wearing these on concrete and my feet didn't start to feel tired / sore until i was a few blocks from home.  Perhaps more due to using different muscles in the feet as there is not as much support.  Though I think my feet / posture is better wearing these!

They look great, I wear them with jeans when going to visit quite a few of my clients (IT) and haven't had any complaints - and a few complements.

I wish they'd come up with a different material for the sole that was a bit longer lasting - take a look at the rubber on ecco's - and they'd be a 5/5