I got these pants because I was soon going to be climbing Pikes Peak in Manitou Springs, CO. It's nearly 13 miles from bottom to top. These pants were fantastic! One of the most important things (I think) is that they are comfortable. The size was true to any other pants I would buy, they were lightweight, an were geat with the changing temperatues. At the bottom it was in the 80's, I rolled them up and was never too hot (because of my pants anyway). I actually think I perfer the roll up rather than the zip off. Less hastle and no chance I will lose the bottom of my pants (-: When we got to the top it was in the low 40's...I rolled them down and stayed plenty warm. The wind didn't go right through them, which was great because it was definitely windy up there.
I think I touched on the best, most helpful parts here. They were true to size, they are comfortable, and great in different temps. I've only worm them for this one big hike, so one thing I can't account for is the durability over a long time.