Teton Dweller wrote a review of Arc'teryx Gamma MX Softshell Pant - Men's on December 13, 2013
Familiarity: I've put it through the wringer
As ever, this is just my opinion. But for my money (and in this case, a somewhat mind-numbing $300), these are the best alpine pants I've ever worn. These aren't pants to be worn if the temp is above 50 F, but below that in anything but a torrential downpour or a wet snow, the Gamma MX are unbeatable. I've worn them in the high mountains of New Zealand, backpacking a 50 pound load in a light snow. I've used them to patrol my property in winter, temps in the 10-40 degree range. I've worn them skiing. I wore them in driving rain and sleet for 90 minutes, and while wet on the outside, my legs were bone dry.
I always think they're going to be too hot for sweaty activities in cold temps, but they're not. They flawlessly modulate my body temp, whether I'm just walking or working hard. They shed snow without issue, and only strong winds below 20 degrees will get through the durable fabric.
I had a pair I purchased in 2006, and I just got another pair now that Arc'teryx offers a "Long". I'm 6'2", 200 lbs, and the Large/Tall fit me perfectly. It should be noted, my original pair show little sign of wearing out, just one small rip around the button. Pristine otherwise.