Firstly, don't order based on the size shoe you normally wear. Measure your feet and order accordingly. That being said, I love these shoes. They are my second pair of five fingers and have been the answer to what I was missing while on the trail. These are a little thicker in the sole to protect a bit more while walking over sticks and rocks, but you still pretty much feel everything. Depending on terrain, your feet can get awfully sore after about 10 miles or so (but thats if constantly stepping on loose gravel, roots, and such that make for a jagged walking surface).
I do very much recommend a pair of thin Injinji socks with these as they are not as smooth on the inside as my KSO which I usually do not wear socks with.
Oh.... probably should mention the traction. It is fantast. The megagrip material allows me to hop wet boulders like a mountain goat. The tread has allowed sure footing when climbing slick, muddy inclines.
Thats it. Theyre good. I recommend.