These shoes take some getting used to.  First, they feel funny and walking induces pain in muscles you don't know you have, for example, in your butt. But persevere, pretty soon you'll be standing straighter, walking straighter and your hips and knees will feel rejuvenated. Then you will crave walks in your MBTs.  I'm a natural-born sceptic of 65.  The effect of these shoes, after just two weeks, amazes me!