I have consistently used Montrail running shoes for the last decade or so, and they have always fit me perfectly.
This time around I was very disappointed with their new line of products. After having had to order 3 different shoes I still haven't found the perfect one yet.
The main trouble I had with the Mountain Masochist was it's profile and lack of grip on the trail. I found my foot slipping a tiny bit every step which I believe had to do with the shoe not having enough grip around the toe area to support my pushing off with the ball of my foot. Montrail's Rockridge works way better for my running style, but unfortunately was totally off in its sizing. At least one size too big.
I might just have to shop for another company making high quality running shoes next time around!