The ads claiming they help tone your legs are really just hype, in my experience.  Due to plantar fasciitis, I wore MBT's at work for three years, then chose these Sketchers purely on price.  Neither shoe did anything at all to tone my legs, but they do relieve my lower back pain, and my heel pain, which is all I was concerned about.  The choice of colors and styles in these Shape Ups are far superior to the clunky, clumsy styles of MBT's, which were 50% more expensive.  I find that after wearing Shape Ups for more than five or six hours straight, my feet feel tired, as if they are weighed down with sand bags.  The shoe is heavier than I'd like in all-day footwear, but I really do need the back and heel support so it's a trade off.  If you wore MBTs before, you will not have any trouble adjusting to these, they have the same principle in design which requires a little getting used to at first, but once you're comfortable with the feeling of the rolling soles, you won't be aware that there is anything different about them.  Though the colors and styles are nice, I would never wear Shape Ups with shorts or capris because they are just too bulky looking on a foot larger than a size 7.  All around, though, a good shoe and worth the price.