I've owned this jacket for about two months and I love it. Adding to the arguments over size, I agree with those that say it runs a bit on the large size, though not sloppily so. Given the larger size, it's ideal for layering heavy layers underneath. At the same time as I bought the Tamarack, I also bought a Marmot Zeus down jacket to wear under it. I wore the combination for a week of skiing in northern Michigan during a week of single digit temperatures and stayed nice and warm. I've also discovered that a North Face Denali fleece jacket or vest zips into the Tamarack jacket, ideal for those looking for a bit more warmth that a 300-weight fleece will provide over the 200-weight fleeces available from Marmot. Two notes of caution if trying this combination--the sleeve retainers of the Marmot do not line up with those of the North Face (obviously not a problem if using a Denali vest), and the zippers of a large Denali are longer than the zippers of the large Tamarack, so the fleece's collar will stick above the jacket collar. I've now bought a medium Denali vest which zips perfectly into a large Tamarack jacket. So as I see it, this is a really versatile jacket with multiple layering options.