I finally relented after being on a Mission for best shoe for my knees and hips and bought MBTs.  I am here to warn you that once you try them you will throw away every other pair of shoes in your closet. i have bought three pair this week!  I am very athletic, walk alot volunteering and have lousy knees.  For the first time in 40 yrs I am not using orthotics!  I feel ilke a bad commercial, but for the price of a pair of soon to wear out Reebok or Asics or anything else, these are amazing shoes. And they work your legs. That's a bonus feature.