I was not sure what to think but I made the plunge and bought them.  I have been running/ walking in them for 2 weeks and I definitely feel and see a difference. It's not that my muscles HURT after running but I do notice a little extra burn in the back of my thighs and butt.  I have noticed that my jeans fit better too. Also, I think that the soles have really good cushioning since I have had knee problems.  A great choice!