These shoes purport to cure everything from an aching back to saggy buttocks. My co-workers joke that they may even cure cancer! It's too soon to tell about all that, but they sure are fun to walk in. They have motivated me to walk every day. The rocker shape of the bottoms propels you forward, even up hill. It makes it so much easier to walk, so if it also tones while it's doing that, WOW!
The only adjustment issues I had with them was a very slight sea sick feeling the first day I wore them and then it was over- it's just the rocking motion that you're not used to.
I got them for back and posture issues and they do seem to make your posture better, and my back hasn't hurt since I got them, but again it's too soon to tell. I've had them a little over 2 weeks.