I have worn a stabilizing NB running shoe for about 3 years now and this is my fourth pair.  The model numbers keep changing, but I have ALWAYS worn an 8.5.  I really like everything about this shoe, but the toe box seems shorter and narrower than in the past.  I should have returned them for a 9, but thought they would stretch enough with use.  They haven't:(  Next time I'll get a 9.