I have two other pairs of Dansko clogs, all in the same size, but these are super roomy in the heel for some reason.  The front of the shoe is perfect, the heel is roomy, but because they are super cute and very comfortable, I'm definitely keeping them.  I've been reading that Dansko's can be a bit off in the sizing even if you buy them in your 'regular' size, so it might be worth it to order them in a few sizes to try them out.