I absolutely love my Shape-ups. I have had 3 pair. Now, I can't say that they have helped my butt or legs look better, but I have not had any knee issues since I started wearing them and I have not had any plantar fasciitis either. I wear them pretty much daily and unless I have to dress up! I never get sore when I wear them, but I do try to workout.
I bought the ones for running, but was not impressed, my feet hurt horribly the next day.
I also have the Reebok EasyTone, and I do not like them. They are not comfortable and are very awkward to walk in.
Good luck!
K.