Yes! I have the Sketcher shapeups and really like them. I only walk on the treadmill with them- I don't wear them out or just around the house or anything. Before I started wearing the Shapeups, I'd walk 2 - 3 miles on the treadmill and not be sore at all. When I walk a couple miles wearing the shapeups, the next day my calves, thighs and butt will all be sore! I know I'm getting a better work out when I'm wearing them. :-)
I bought Avia's version of this toning shoe. I love them! I did read, however, that you weren't supposed to run in them. Actually they feel weird enough on my foot that I don't think I'd want to run in them!