Although this could have been added to the Equipage Level 1.5, 2 or 3...I thought it might be useful as a stand alone piece.
Around 2010, I gifted my North Face Expedition 900 Down (may have been 850) to my nephew. Too warm and too bulky. I stuck with my Arcteryx Atom LT and more recently, an Arcteryx WX (a bit heavier, DWR shell and no thermal side vents). I surmised I was done with down as I moved to central Canada (Eastern Ontario) and it is not overly cold.
I began thinking a down sweater may be a good, lightweight and packable option for hiking and camping. I only use my Arcteryx WX for work as it is a tactical (Coyote not MC but, with TRF velcro patches) midlayer and I didn't want to show that hand when out and about. I found a deal on an OR Transcendent Sweater. The current one is 650 fill and 13.1 oz. Mine. Has been a nice piece, warm and light. Pretty happy with it.
At Christmas, I was sent a sale notice from Kuiu. I used to have quite a few of their pieces and was intrigued by their Superdown Ultra jacket. I know they have been working for years with the hydro down. The sale was 50 or 60% off on the solid coloured, hooded variant. So, I snagged one for $260 I believe it was. I was a little skeptical at first, 850 fill and only 8 oz. It seemed too good to be true.
Although not for extreme winter conditions, I can attest that at -22F with a shell over top, this thing is extemely warm and it has been awesome. It packs into the hand pocket if need, and takes up no more room than a 1L bottle. I have been super impressed with it. I have not used it in wet conditions but, like all down (even if it is treated like Kuiu's is) I would be hesitant to wear it as an outer in anything more than light snow. It is a great piece to add to your midlayer or warm piece when sitting still or for low impact activities. I used it skiing at -20F and it was great.
I may not have grabbed it at full price but, I am so happy with it, I thought I would let all of you know. If you are in need of a super lightweight, packable and extermely warm down jacket, keep your eye on their sales.