I read the reviews for the MBTs and Reebok version before purchasing this shoe, thinking it would be the same thing at a lower price point. I buy almost all my shoes online and have never once had to return something due to fit. I wear a 9.5 - 10 shoe and purchased a 10. The length of the shoe fits fine and the width of the base is a little big, but not too much so. What's strange about the shoe, however, is the size of the foot compartment, especially in the front of the shoe. I have the laces pulled together as tightly as it can possibly go and it's still too big. I know a size ten foot is large for a woman, but that doesn't mean she has sausage feet. I'm 5'9" and a small size 8, so I'm not too thin nor overweight - just normal size with feet you'd expect on a tall woman. Seriously, I couldn't fit into any of my shoes when I was pregnant with twins, but I bet these would have been perfect. Perhaps they didn't make the mistake in the smaller sizes, but I would really recommend trying on the shoe before ordering it.

The other thing I find odd about the shoe is that there is no arch inside the shoe. I guess these would be perfect for someone with flat feet (even better fit if your feet are flat and fat). I needed to add arch supports and haven't had to do that with any other sneakers.

Aside from the fit, I do think the sneakers are doing what they promised. The roll is so far that I found my knees hyperextending a little bit, but I quickly got used to avoiding that. I think the shoe would be more effective, however, if it fit better and I didn't feel like the front of my fit could slide around so much.

Overall, the shoe probably does what it claims. The fit, however, is unlike any sneaker I've ever worn before in that the size 10 will only fit if your feet are very large in terms of height and width and also flat. I'd recommend trying a pair on at a store even if you plan to purchase online. I'm keeping mine, but will also be purchasing a pair of MBTs or Reeboks, depending on which way the reviews of the new Reeboks go.