I've had these shoes exactly 6 months and wanted to give a follow up review.  The little air pockets that give them their toning effect, completely gone.  Of course, these shoes get heavy use because I wear them to work almost every single day.  But my work is walking on flat even surfaces.  They still look great and the structure of the shoes is still good.  So basically, after 6 months of use, I have a good looking normal shoe with an odd looking sole. Maybe Reebok could work on creating a EasyTone shoe with replaceable air pockets?  So you get more bang for your $100 investment. ;)