I received these shoes in the mail today and just went out and walked two miles in them on a paved road. They are very, very comfortable. I like the cushioned ankle support and the airy feeling each step has. I don't feel like they have worked anything yet but as another reviewer said, she didn't feel anything until the next morning, so I'll see how that goes. So far, however, I think these are great shoes.

December 26th 2009 UPDATE
I have worn these shoes when I walk over the past 3 months and haven't seen any actual difference in my muscle tone. However I still agree with the fact that they are really cool looking and extremely comfortable. I consider myself an active person and may be "too advanced" for these shoes I guess. But I'd still recommend them. I'm dropping my rating from a 5 to a 4 only because I saw no actual difference in my muscle tone.