I'm reviewing the tan pair with the concave cork bed (I want to be fair, as other very similar Kork-Ease products are great).
As others have mentioned, the foot bed is weird---it throws everything off of what is otherwise a nice shoe---I have purchased other similar Kork-Ease (with different footbed) that are perfectly fine.  After walking around in these for an hour, I was in dire need of a chiropractor---my hips hurt and my back was screwed. I would have returned them if I hadn't walked around in them.

In fairness, it might be fine for someone who has no body issues. The whole reason I buy this shoe is for it's vaguely orthapedic (for a platform) nature. It's too ugly for this kind of pain.