I have a very wide fore foot.  Because the back of my foot is normal, I step out of wide shoes so I generally will by my shoes a little large to get the additional width.<br /><br />I have the Vomero 9's and they worked great because they have a very flexible toe box.  Nike, as is typical, has reworked the shoe in the Vomero 10.  When they did, they made the toe box is a little more rigid and the shoe in general is narrower.<br /><br />I have worn the shoe for a handful of days to break them in.  They are very comfortable to walk in, but they really hurt on long runs.  I have now run 3 times in the shoe each time for 13 miles.  Around mile 9 my right foot really starts to hurt.<br /><br />*** End of the Year Update ***<br />I've now worn the shoe in 2 marathons (and the related training) and I wanted to report that my initial impression still holds true.  The toe box didn't expand much with wear.  I also wore through the rubber and foam portion on the bottom on the shoe faster than I would have liked.  I guess its time to find a different shoe for next years training.