I've worn NB shoes for almost 20 years.  Always worn a 9 1/2 EE.  So - I ordered a 9 1/2 EE.  Too short and MUCH too narrow.  Soooo... sent it back (at my expense) and ordered a 10 4E.  I was afraid I might swim in the 4E...  Shouldn't have worried - still way too narrow. Sent the 2nd pair back (again t my expense).  Gave up.

Moral of the story here is don't buy these on line.  Find someplace where you can try the NB 780 on before you buy.  The sizing is way off.  I don't know what NB is doing - but they are not maintaining any standards in their sizing.