JonathanSWwrote a review of Montrail FluidFlex Trail Running Shoe - Men's on August 14, 2013
Familiarity: I've used it several times
I wear this shoe in an 11 for the length, and perhaps (at least some of) the shortcomings I found are a results of a too-wide-for-me toe box in that size. I found this shoe to be sloppy. I didn't feel that it stayed planted through a running stride. My second issue, however is less about fit. The soft foam of this shoe was problematic. It added to an insecure squishiness and the feeling that the shoe was moving under me (when it was supposed to be in place). Despite that thick squish of sole, the soft foam didn't protect well against rocks. I felt them more clearly (ie uncomfortably) than in any of the other shoes I run in. So for me, the foam was too thick to provide good response and connection to the ground, but not stiff enough to protect against terrain.
On the other hand, it is a very lightweight shoe.