I just got these yesterday and wore them around my house for an hour and then went for a 1/2 mile walk in them.  So far I absolutely love them.  They fit well and are very comfortable.  I bought these after seeing Kim Kardashian on Jay Leno talk about them.  She said they are designed to make it feel like you are walking on sand.  I wouldn't go that far, but you can definetly feel a difference when walking in them.  Some reviews on these talk about them causing back pain so I am hoping that doesn't happen.  I usually wake up with back pain and this morning was no worse that usual.  Since I've only had them a day, I'm not sure about the results of toning my legs.

The main thing I am noticing about these is that it corrects my feet while walking.  I always walk on the outsides of my feet;  my shoes always wear on the outsides.  This can lead to Cavis Foot (my sister had surgery on her foot because of this).  You can buy inserts to try and help correct your feet while walking, but I don't really like them.  I feel like these shoes mold my feet inward.  I can even tell just by standing still in front of a mirror.  Now I need to look into shape-up sandals cause I can't committ to wearing sneakers all the time!

My only negative remark about these so far is that they add like 2 inches in height to me.  This is probably a good thing to most people, but I am really tall to begin with.  Other than that, I am sold on them =)