I read that crocs were really disapproved of by podiatrists, but I tried them and my PF went away just like that. Then I went to the podiatrist and confessed, and he said "oh, crocs are GREAT!"
Obviously it depends on the feet. I wear them indoors, mule-style (strap over the top, not behind the heel) and they're so comfortable. Shaped instep and a ridge behind the toes. I don't have to grip with my toes, which is the usual criticism. But my feet arevery wide, with the first four toes almost all the same length.
So they may be worth trying for some feet.