So, I have a size 10/11 narrow foot and the large boot fit me very well.  In fact, it was surprisingly comfortable, especially since I don't normally wear heels and they do add about 6-7 inches of height.

As for the scuffing, I covered the boots up with fur anyway for my Halloween costume so it didn't matter much to me.  In fact, the material works REALLY well with hot glue, since the glue pretty much melts the latex.  I was very happy with it.