I wear a size 6 and ordered a size 6.  I just got them in the mail today. I tried them on and the fit is great.  I think these might be the ones to kick start my running for the summer.  I ordered these based on research for running shoes for flat feet and running style.  I read several reviews and watched a couple of different youtube demo review videos for this particular shoe.

Do not base purchase for running shoe on just one tidbit of info do your homework and know your feet. P.S. Ive returned more than I can count to find the right fit.
Update:  4/18/18  I LOVE THESE SHOES!!!!<3
I wore them to the health club last night and ran on the treadmill for about 25min.  OMG!
The shoes were so comfortable I only wish I had them when I ran the 2018 Chicago Shamrock Shuffle.  It was like running on marshmallow paved streets.  Seriously,  I have flat feet and some ankle problems.  The shoes supported my feet and my ankles.  LOVE HOKA ONE ONE Vanquish 2 running my 1st pair but not last pair.