This is my first time trying the barefoot running shoes.  I was told that the Merrell were the way to go.  I have only used them a couple of times but I am sold.  They are great and really improve your posture for running and my recovery seems a lot better the following days.  Definitely would recommend.  The sizing is true for me.  I float between and 11-11.5 in most and I bought an 11.5 and they are just a hair big...so size them to what your normal shoe size would be and enjoy your running!