I've had this color, this style of Shape Ups for well over a year now  - the sole shows no wear. The only thing that concerned me was how to clean them when they got dirty..
But! Use the Mr Clean Pads you can get at the grocery store, squeeze pad under water, and scrub, scrub.. All smudges and dirt comes off, just lay in the afternon sun to dry. They are fantastic shoes, get them and you'll be happy. Even with knee replacement and fallen arches they are the shoes to get.
**********  June 12, 2015 : UPDATE: These shoes are now nearly 2 years old. The fit is still perfect. The outside barely scuffed. They hold up amazingly well. * Best of all, I can wear them comfortably, even though I have a Bunion!  *********