I wear a size 14 Nike, pretty spot on.  The 47 Vibram works for me in lots of their varieties.  I picked up this pair for light hiking/trail running and it hasn't let me down.

They are comfy, once you get used to them.  And if i maintain a good foot strike, without dragging, i feel they will last me at least a year.

I fought buying, or even trying, 5 fingers for years.  Once i got a pair, i really enjoy them