I love my vibrams. It took 3 or 4 runs to get my calf muscles up to any kind of strength to be able to run in them, but it completely vanished the knee problems I'd been having, simply by forcing me to change the way I ran.<p>I wouldn't wear them every day -- they are, as others have pointed out, not as warm as ordinary shoes. But if you're running or hiking, they feel great and are better for you.