Got two different pairs.  I usually wear a 10 and my foot is wide, so I got the 10W (naturally).  I wore them one day at work (I only work desk so it wasn't even that much walking) and I had blisters on the back of my heel and on the top side of my foot by the big toe.  I really LOVED the style of them so I sent them back and got an 11.  They seemed smaller than the 10s in those two areas.  Super weird and super disappointed.  Sent back and got something else.  Oh well :/