i've been wearing this shoe mdoel since I found them 5 or so years ago. this is my 4th pair. Each conception of them seems slightly less quality as the model before, but they are still a good shoe. I wear an 11.5 US and the size remains true with this model. My foot is slightly wider and flater than normal and i have never had a problem with the medium size width. The neoprene'ish sock-like tongue is my favorite component of the shoe. The dual foam for pronation control is also still good. The clear plastic arch support and ankle strap is cheesy. The shoe is fairly warm - it's warmer than my previous model of this shoe. It's been my experience that the soles hold up well for lightweight hiking, but scree slopes are vicous on them. Mine ussually live for about 1.5 years of near daily townie use and 150 or so backcountry hiking miles. The gortex will rip if you hike in rough terrain - the waterproofness goes out the window after that - it's a pointless amenity in my opinion. The toe seems better design on this shoe than previous "running shoe" style toes - this model has a rubberized nylon on the front of the toes instead of suede-like toe box - it seems like a durability improvement..