I tried on both the Pace Glove and this one.  Ended up settling for the Vapor Glove because it definitely felt much more "barefoot" to me.  I felt like I was wearing a shoe when I tried on the Pace Glove, but with the Vapor Glove it's almost like wearing nothing.  The Vapor lacks any supportive strips of material (aside from the mesh itself) around the sides or front of the shoe, which is a plus for me--that stuff always ends up digging into the sides of my feet, and was the main reason why the Pace Glove didn't work for me.

Runs true to size.  I wear an 8 and this fits well without socks or with very thin socks.  Feels pretty comfortable without socks, although after jogging for a little while I can feel where the footbed meets the side of the shoe (although, that's probably because my wide feet are pressing up against the sides more; I have a feeling that probably isn't a problem for most people).  Fortunately these shoes are quite flexible in terms of width thanks to the minimal mesh construction and laces.  I'm just getting started with jogging in barefoot shoes and am taking it slow for now.  So far I've found these shoes very comfortable and haven't had any foot or leg pain.  No irritation or rubbing either--they fit like a glove!  Can't wait to use them for longer jogs!