So I visited MEC yesterday to check out the Uplink jacket. First up was checking the weights, I weighed the medium jacket at 265g and the large at 271g, so their claim of 274g is seemingly based on the large.
The weight seems to change by about 5-9g per size. In the ladies sizing I weighed the XS at 231g and the small at 237g. I was pleased to see MEC is accurate with their weights for this item. Unfortunately they didn't have the ladies pullover version in stock. My wife is planning to order one of those.
The sizing of the jacket is generous. I usually wear a medium and in this case, I bought a medium but it is a little big which I guess is good for layering. I can easily wear this over a hoody. I'm 5'11" and 160lbs and I would have tried on the small if they had it in stock. I still likely would have got the medium though. As the Uplink video says, the jacket is longer in the sleeves and overall length which is nice.
One thing about the coat that disappointed me is how thin it is. This jacket is very thin. It almost feels like there is no insulation in it. I would say the loft of the jacket is about 1/4". I haven't done any scientifc testing, but it seems similarly warm to a medium weight fleece.
One other aspect of the jacket that I wasn't thrilled with is the neck. When you zip it up all the way, the neck is pretty loose so the neck insulation isn't doing anything. I can fit my fist inside the neck of the jacket when it's fully zipped up.
I've already trimmed a few things off this jacket to save grams. I cut off the inner tags (2g), removed the wind flap behind the main zip (5.2g) and cut off some excess white fabric from behind the breast pocket. My size medium now weighs 257g (9.065 oz).
I wore this jacket last night under my rain shell (which are the two jackets I take hiking) for a 20 minute walk. It was 9 C outside (45 F?). I was adequately warm but I suspect I was nearing the limits of this setup. I'd probably want to bring along an insulation vest for colder trips.
Stuffing the jacket into it's breast pocket for storage is a simple process. The pocket is an appropriate size so it's easy to stuff in. The stuffed package is probaly about 1-1.5 litres in volume.
Overall, I'm happy with the jacket but I do wish it was warmer so I could get more use out of it. This is probably just a jacket for summer nights....not early spring or fall. For comparison, the Western Mountainering Flash jacket weighs about the same as this jacket but it has a hood and a ton of loft thanks to the 850fp down. This makes that coat good to below freezing according to the BPL review. So it seems that a similarly heavy down jacket will be much warmer, but also more expensive and like all down garments, suffer when wet.