I got these to have an extra pair of shoes for work, to give my Shape Ups a break from every day use.  When I took my first few steps in these it felt like walking on jello or really spongy pillows. I couldn't believe how comfortable they were.  Unfortunately, for me that feeling did not last.  I work 12 hour shifts on concrete floors, and after a few hours that cushiony feeling just went away.  I started to feel the hard floor right through the jelly bubbles on the bottom, like they were just flattening completely with every step and not offering any cushion or support.  When I got home and took them off, my feet were throbbing.  The next night when I put them on again, they were back to being little pillows of air-filled jelly comfort--and again only for a few hours.  They are also cut more narrow across the front of the foot than all my other shoes I own in the same size, which gets painful after only an hour or two of walking in them.  Other than the width, they are true to size.  Overall, I think these would probably be great for doing a 30-60 minute workout, or going for a walk outside or on the treadmill.  They just don't stand up to extended wear and constant walking over several hours--and I doubt that they were meant to.  I might recommend them as an exercise shoe, but I would suggest getting a wider width unless you actually wear a narrow.