Jaime wrote a review of Patagonia Mixed Guide Softshell Pant - Men's on October 21, 2012
Familiarity: I've used it once or twice and have initial impressions
I picked these up for an ice climbing/splitboarding trip coming end of November in AK so function/durability-wise, we'll see.
Wanted to add some sizing info though since that is always hard to decide if you can't try them on. I'm 6' and 145 lbs. I tried on both the 30 and the 32 and ended up with the 32 mainly for the extra length (I think they are an inch longer). However, I could have easily gotten the 30 as well. The way Patagonia designed these with the waist belt is perfect. The 30 and 32 both would have allowed for proper layering and fit perfect but I usually have problems finding pants long enough that fit my waist which is why I opted for the 32. I think it's safe to say if you have problems with pants not being long enough, you should be able to size up (for length) and still have them fit ok.
I have the Arc'teryx Beta AR hard shell pants but wanted something a little more specific to what I'd be doing. I think these will hold up excellent though!
Lastly, they seem to fit over all my mountaineering and snowboarding boots just fine.