I took a lot from the recommendations here before deciding. The Avery podcast made a good argument for synthetic, I wanted a quiet jacket, and one that I could wear when active for archery and rifle seasons. Looking at weight, the synthetic KUIU (although not as warm), was right there with most the lower cost option down jackets. I have my soft shell for wind resistance, and my rain jacket for a wind or rain shell so was happy with breath-ability for the puffy.
My jacket just arrived. No real world testing yet, but this thing is insanely light! I though there was a mistake when I first picked up the package off the porch. It is well made. The XL fits nice, the lower cuff around my waste fits well and seals up nicely. I think any larger would have been too loose and unneeded bulk when layering under my soft shell, this fits and conforms well without being too tight or restrictive. It easily fits over or under my soft shell depending on what I want to do. It is much lighter and more compressible than the 100w fleece layer I have been using, and fits under my soft shell a lot better than the fleece. I was uncertain when ordering, but it is definitely replacing the fleece.
I look forward to trying it in the cold and seeing how it performs. My deer season ends tomorrow, but I will have to take my buddy out for late season bear just to try it out in some cold weather.