I purchased these shoes and ended up in Physical Therapy.  Watch the video before you wear them!  I wore them around my house for 30 minutes the first two times, out shopping for two hours the third time, and all day the next time.  They injured my hip and thigh so severely I had to go for PT for several weeks.  I tried breaking them in very slowly a year and a half later and again my hip is aching badly.  Apparently they're not for everyone.