I owned a Montane Polartec Neoshell stretch shell for 1.5 years prior to this purchase, and the taped seams started to delaminate. Warrantied it and got this instead.
I have not used yet in significant weather, but had to write a review. I always have problems finding clothes and jackets that fit given my body type; 5'11" 147lbs, 38" chest, long legs long arms (I fit a 34/35 dress shirt), shorter torso in comparison with about a 29.5" waist. Anything I buy typically I have to size up to get the arm length even though I prefer a tapered fit. The prior Montane I had was almost long enough in the arms in a size small (that was the only size left, so I made do).
Enter this jacket. I was certain a small would not fit given the "size up" comments in the reviews, and that my chest size was on the border. But, small was the only one at a deep discount, and I hate overpaying so I took a chance on the small. IT FITS PERFECTLY. Arm length is long enough that I can stretch out with it fully zipped and it goes more than halfway down my thumbs. Built so that arms don't pull with movement. Roomy enough for me to layer my midweight down plus something else, tapered enough that it is not baggy when worn as a stand alone rain shell. Literally, it is like this jacket was designed for my body type, so if you are similar don't hesitate, do it.
I did buy the Montane Endurance Pro shell to try on with this jacket (small as well). While arm length was about the same, it was just a touch baggy in the wrong places (arms, chest) in a way that just didn't feel good or fitted. Also, the Montanes have a super high collar that literally covers the nose (both the Endurance pro and my prior Polartec neoshell), and I found that wearing goggles I could not zip it all the way up as it was automatic fogging if I did. The Marmot is roomy enough to layer without feeling baggy (hard to explain, both have room enough, but the Marmot is cut just right so it is roomy enough without feeling baggy in those areas - trying on both my wife noted this right away). The Marmot also has a high collar, but standing straight and relaxed it comes to the bottom of my upper lip, which for me is just perfect - can duck my nose in for extra coverage if needed, perfect coverage for no-fog when wearing goggles.
Features are more than most technical shells, with inclusion of a waist gaiter (seems most alpine shells don't have them, but for the snowboarder that I am it is a plus). Two inside pockets (one is an open mesh for goggles), 4 outer pockets and an extra sleeve pocket to boot. I am in love with this shell. I don't think there is anything I could do to design it better.
Thank you to Marmot for a job well done. Thank you backcountry for the excellent sales team, taking care of my warranty issue, and getting this out to me. You guys rock.