I tried on the Burton Moto in size 12, which is what I wear in a normal shoe size, and my toes were right at the end but not uncomfortable.
I then tried on size 13 and it seemed as though even after tightened, my heel moved up and down. What I don't know is how the heat molding will affect either boot.
I got rid of my last boots because my big toe would rub. The size 12 just has me a little nervous, that's why I looked at 13s.