I've tried on several trail "barefoot" shoes and these feel awful.  I normally wear a 7.5B (normal width) and most of the NB shoes in 7.5 are plenty wide enough not to cause any friction points.  These feel like they would shear the skin from the bone if I were to try to run in them.  The strap across the instep presses hard against the base of the big toe bone (where a bunion would be if the toes aren't straight).  It's tight, narrow, and inflexible; not a barefoot feel at all. If your feet are extra narrow, this might work out for you, but the shoe's upper must be more flexible for my needs.

The length runs about a half size too short compared to most shoes, and it feels a whole size smaller than the NB V0 Minimus Trail shoe.  The width of the V0 version is like a wide, and this V10 is like a narrow.

On the positive side, the sole is very flexible and yet protective enough that you won't bruise your tendons on rocks or tree roots while trail running.