So I recently purchased 7 different down jackets so I could wear and compare and select the one I liked best. This was my great down jacket review, not because the review was great, but because the breadth of comparisons was pretty extensive. The ones I compared were the Marmot Zeus, Marmot Tullus, Mountain Hardware Nitrous, Mountain Hardwear Micro Ratio, Patagonia Down Sweater, The North Face Trevail, and the Outdoor Research Tanscendent. I'll put comments on the others in the listings for each. The reason I selected these are that they all are basically medium-weight down jackets (not extreme light or heavy) and were comparable on the prices. Backcountry was having a sale and all these were marked down to between $123 to $160.
What I wanted was a top layer jacket without a hood (don't use hoods very often). I generally don't use down jackets like these as a layer under anything because of their bulk. I prefer a synthetic for that. I have a huge down jacket with a hood for very cold weather. I wanted one that was less bulky and more suitable for activities.
So the Nitrous. The Nirous was great! I really liked it. But as other have said, it's huge. The one I had was Thunderhead Grey and it's a beautiful color that looks a bit grey, a bit green, a bit blue - it seems to change depending on the lighting.
Fit: Has a regular fit, but is huge. If it fit, the fill wasn't over-stuffed so it didn't seem bulky that it restricted movement. So the XL was too big. Since I live close to the warehouse in SLC I also tried the Large. Sadly, the Large was a bit too small.
Comfort: The jacket's fabric was plenty comfortable. Very comfortable. The hand pockets are a bit more to the side than I would have liked and the openings could be a bit more angled. Neck and cuffs are basic but fine.
Misc: Love that it had a chest pocket. Q. Shield is supposed to keep the down dry. I don't know how well it works. I don't plan to use a down jacket in the rain.
I ended up returning the Nirous and choosing the Patagonia Down Sweater. However, this jacket would be great if you're a bit heavier than I or if you're lighter and get a Large. The two jackets were about the same price. This was a couple bucks less.