I am glad I started this thread! I think that PF is completely individualized. My mom has it too and once she wore her Birkenstocks, her pain went away, where mine just stayed the same or got worse. I think I read something about crocs and how they are made for certain support. I think the Birkenstocks that are plastic w/o the cork inserts may be just as good, but they are really expensive-I can go 12 hours w/o any pain now AT ALL-I am still in shock

I wear an 8 and bought an 8 and with the strap my toes touch the front and it is just too snug, so I go w/o. I could have bought the 9's I think but there weren't any in the black so I got the 8. Of course, at the time I didn't want the strap, now some times I wish I had the option. But, no reason to change right now. I may have to look into the relief ones.
I catch my right foot ALL THE TIMe. I have to laugh at myself as I go tripping down the hall. I did the same though when I wore my birkies, which are also a plastic. I think my right foot is a bit lazy (plus, it is a little longer than my left).
anyway, if they have worked for you GREAT! If not, the birkies are good and some places will give a discount for medical workers (but I think they only came in white). They aren't the regular birkenstocks though-just called birkies. I guess the last best thing would be orthotics made special for your own foot. I know I stand heavy on my heels with my knees hyperextended from that injury-so maybe there is something there with the heel that the others don't have. My arch doesn't hurt either.
Strange. Well, I know what I'm gonna wear assuming ours don't get banned! (I don't see it happening though)