I have the Orthaheal Wave flip flop, clog and a sandal as well now.
I had full ankle reconstruction in Sept '09. They cleaned up the tendon above my arch and broke my heal to widen it. Orthaheals made it possible for me to walk during my recovery.
The built in arch is wonderful. I had 2 screws in the back of my heel to heal the bone they broke, the back became (and still is most of the time) super sensitive so it hurt to wear shoes with a back, so I couldn't wear my custom fit orthotics. The orthaheal orthotic built in did the trick. Plus my nerves were so sensitive for over a year I couldn't walk with out a shoe on, I even showered in those things.
Plus, they hold up. I still wear that original wave I bought in April '10 and wore daily all the way until i bought their clog in October and used to shower until Dec '10. Plus as my slippers. They are bit scuffed, but the support is as good as day one.
Now I wear the sandal version daily since it's a bit nicer for work. I've found out I have new tendonitis in the back of my heal which is why it hurts to wear closed back shoes. We are working on this with stretching etc to avoid more surgery, but I know this brand will be in my future for a long time.