I normally wear size 7, but I ordered size 6 based on other reviews.  I found them a bit short and had to return them for the larger size.  The process was quick and simple.  Although I frequently wear thong-type sandals, I found these required a little getting used to between my toes.  I like their modern look and thick soles which add a little height.  As far as tightening the butt, well as written, I like the look and height, but the butt hasn't moved.  I do feel they are pricey since they don't tighten anything but the budget.  For $30.00 less I would buy more.