I paid attention to the reviews to get an idea of the right size to buy, but, unless there is inconsistency in the manufacturing, I can only conclude that customers just expect ballet shoes to fit differently than they actually do.  I ordered my normal shoe size and they fit perfectly.  I tightened the elastic and retied it to customize the fit.  I also read concerns about no difference between right and left -- but there aren't supposed to be -- you can either alternate to enhance the longevity of the shoe (they wear more on the big toe side), or wear them consistently to get a nice custom fit.  These seem well-made and durable, and the elastic strap is placed correctly. They've made it successfully through my rugged Scottish Country Dancing class and I fit right in with these.