I read a bunch of reviews before I got these, and I have had them about a month.  A lot of people complained that the heel is loose and they slide around. I discovered the real reason for that complaint is that the sole of the show doesn't bend like a normal shoe. At first that didn't really bother me because the top of the shoe was still firm enough to keep my foot firmly in the shoe. Now that I've been wearing them everyday I have to have them laced almost uncomfortably tight to keep the heel from slipping. And honestly they aren't that comfortable. Because of the shoe design all of your weight is balanced on the middle of the foot(the arch area) not comfortable. Also with all the great padding there is none on the heel! So my heels hurt after wearing them.
  The other problem I see is with the name. They do not shape you up at all. I wear them everyday. While may not have time to walk a mile or 2 a day I do walk quite a bit throughout the day and there has been no difference at all.  So I'm really disappointed, I spent $100 dollars on uncomfortable shoes, next time I'll stick with my $30 Dr Scholls.