I've had this jacket for about 8 years now. Initially it was great—I used it on the requisite hiking and backpacking trips, but also as a rain jacket on my motorcycle in the Texas summer showers. Initially it worked incredibly well, but over time, even with reapplication of DWR, it's less than what I need.
When I first got it, I used it heavily in downpours while riding my motorcycle, frequently at 70mph on the freeway. It kept me ALMOST bone dry, with the exception of one little dribble that worked its way through the front zipper. I couldn't complain, I was subjecting it to harsher conditions than it was designed for.
However, over the last three years, I've been using it here in New England as my hiking, backpacking, and mountaineering shell, pulling double duty as my bicycle commuting rain jacket. During this use, the waterproofing has suffered.
in early 2014, one of the seams inside the left armpit started experiencing delamination. I contacted Marmot, and they fixed it up (for free under warranty, I believe). When I received it back, I decided it was probably due for another DWR treatment. I always use spray-on rather than wash-in for membrane products. Shortly thereafter I started to notice that my shoulders felt cold and wet under my pack straps, primarily when biking but also when in the woods. At first I thought it might just be heat conduction from the cold water on the face fabric. But eventually I noticed actual soaking on the garments beneath the jacket. I've retreated DWR several times, and always give the shoulders some extra love, but no matter what I do they always soak through after a short while.
About two months ago, the seam that Marmot had repaired started delaminating again. The shoulders are still wetting through.
While this jacket keeps me fairly dry, I can't give it a decent rating because it doesn't live up to expectations. From what I have heard, Gore-tex products should last 10-15 years when treated with care. Mine goes in the wash after every second or third use (unless I'm riding, in which case it gets washed as soon as there's sunshine in the forecast). I retreat the DWR at least once a year. I wash with soap, not detergent, and do a second rinse. These are all care guidelines from both Marmot and Gore-tex. Even with this care, the jacket doesn't hold up as much as I'd like it to.