Aaron W.wrote a review of Arc'teryx Gamma LT Softshell Pant - Men's on February 18, 2013
Familiarity: I've put it through the wringer
For a while I was using my Arcteryx Beta AR uninsulated hardshell pants for all things alpine. Saw these one day and figured I'd try them out. I never realized exactly how versitile they were.
So fit specs first. I'm 6'2", 170lbs. 32" waist. Medium in these pants fits great for everything (supposedly M is 33" waist). Though on the fit chart they state the inseam as 30.5", but IMO it fits more like it has a 32-33" inseam based on my work slacks.
Before this, for regular 3-seaon hiking I'd use my Mountain Hardwear hiking pants, which are pretty great. For alpine I'd layer my Smartwool long underwear with my Beta ARs. Gaiters on top and the Beta ARs unzipped on the sides as much as possible until things got too cold or windy.
Now: I use these for three-season hiking unless shorts are called for. They're just so durable and breathable. And if it rains, they're really solid there, too.
For alpine conditions, there is enough room to layer under the Smartwool long underwear and if the weather calls for it, the Smartwool and my REI Polartec fleece pants. Gaiters on top of these. I'll keep my Beta ARs in the pack and if things get too hairy, quickly layer those over everything.
It's been great because these breathe much better than the Beta ARs, obviously. They're been extremely comfortable and so far pretty durable, though I've only used them a season so I can't speak to long-term durability. However, if they're like anything else Arcteryx, they'll last forever.
The price is pretty high, but I think it's worth it, especially if you are planning on picking up a pair of softshell pants or a pair of nice hiking pants anytime soon as these would replace both of those and help offset some of the initial cost.