I think these shoes are another case were they seem to fit wider feet better than narrow feet. I'm almost never able to go a half size down in most shoes because of the width but these fit me really well .5 smaller. It even got rid of the heel slip that I experienced in my normal size. These observations are just from trying them on though. I'm going to give them a run tomorrow afternoon.
It seems like the reviewers who love the went down in size. Nightwings review seems to be based mostly off of the primeknit version, so that could be way different as well.