Had difficulty with them coming unstuck.
The concept seems brilliant but just try to get them to stay where you've stuck them in your shoe. The heel pads came unstuck first--probably the third time I wore them. And it's not as easy as you might think to correctly place the ball-of-foot pads. It took several tries to identify the perfect place for them, and by that time the adhesive on the back was shot and they came unstuck.
Rating: 3 stars