I have lovely arches, but I also over-pronate. I found that wearing the Superfeet all the time in all my shoes made the most difference.
The nice thing about wearing them in all your shoes is that your feet/ankles strengthen themselves while wearing the insoles. And they are strengthening in proper position.
If you have a true structural dysfunction (as opposed to a muscular one) plain neutral footbeds like Superfeet won't solve all your problems. You might need "posted" footbeds or orthotics. I used to do posted footbeds for a podiatrist's patients. If the posted footbeds didn't solve the problem after 3-6 months (with PT, too) he wanted them to come back for orthotics.
("posting" is just wedges and lifts that are gummed on the back like stickers, and the PT or podiatrist sticks 'em to the underside of the Superfeet. If after a few weeks you hate them, you just peel 'em off. No harm done. $15 down the tubes, though.)
"If Americans want to live the American Dream, they should go to Denmark." - Richard Wilkinson