Dreamworks Turbo "Cars"

From the new Dreamworks movie, Turbo, I saw that Mattell is making "Cars" and a track that reference Super Speed on them. You can buy a set that has one of these cars on a track that you can roll back and forth in the box. I have to say these things rolled REALLY good.

For the back wheel it was one solid metal piece for the wheel. Kind of like a steam roller.

I didn't want to pay $7 for a set of two "cars" just to see, especially with the increased friction you probably would have. Has anyone else tried them yet?

Here is an image that I found where you can kind of see that back wheel. Wish I would have taken a better picture myself when I saw it.