Excellent input on both brands here. First Lite's sizing does tend to run a little large so trying on what you like prior to purchasing is a big plus with regard to First Lite and Sitka. Sitka and First Lite are the two most durable of the big three mountain hunting brands in my opinion. However, a few of my more notable hunting companions and outfitter buddies are now swearing on the durability of their Kuiu. I would agree that FL's merino is tops in terms of quality, durability and killability. Merino blends tend to get noisier when walking through brush and I think they have a glare or sheen to them like general synthetics. The Uncompahgre is an outer layer that I absolutely live in day in and day out. Lightweight, super warm and it looks good. One thing to keep in mind is that it is not a down parka like Kuiu or Sitka.
Merino may not impress as many humans as synthetics, but it is much quieter than anything else in the mountain hunting clothing market. When you try on hunting clothing always make certain your garments pass the "scratch test." That is, run your finger nail, a toothpick, small stick or other object over a hunting garment to confirm what it sounds like when branches or brush rubs up against it. If it makes noise don't buy it. It may look cool, but you will spook every animal within ear shot if you wear it in the woods and are mobile. Disclaimer: I am one of FL's Pro Team dudes but I live in their gear because in my opinion, it is the best for my style of hunting and activity level.
-Cody
Edit: All heavy duty puffy jackets are noisy. Great for glassing and keeping you warm, but noisy as hell in the brush.
