Mine are awesome on my feet and knees. They feel so good to walk in, and they are great for standing on my kitchen floor. I wear high heels all the time, and I tend to walk kinda hard. These shoes at the end of my day massage my feet. When I can't walk any further, I change into these shoes and keep on moving--lol. My knees bother me, too, and these shoes are made to absorb the shock of walking, especially on hard surfaces.
I wanted some but couldn't see myself spending $50 for a pair of glorified flip-flops. Then, a friend sent me a Victoria's Secret gift card, and I decided to use it for something that I wouldn't buy with my own money. That was over a year ago, and I am still in love with them.