Ellen, I wear the standard, so I can't help you with the open toe. I
have a very deformed foot, though, and they make a mold of your foot
so that the brace fits it perfectly. I've had mine about two years,
and just the last couple of weeks, have had a problem with it. a bone
(or something) has shifted in my foot and is causing the brace to rub
against part of my foot. i don't want the skin to break down there, so
I'm laying off the brace until I can get in to have it adjusted. Other
than that, it's been great. I can ONLY wear it with certain tennis
shoes with their insole removed. that's frustrating, but better than
not being able to walk.
Good luck, and sorry I can't be more help.
diane