I've only had it for a few weeks, but have gotten some good use out of it so far. It is about as warm as midweight fleece and stuffs down very small with the included stuff sack. The Thermastat lining is a nice touch; wicks fairly well and gets rid of that cold nylon-against-the-skin feeling. It has good windproofness, is fairly breathably and water repellant. When wet, it...surprise...does what a synthetic insulation should, keeps you warm. In addition, it dries pretty fast too if you are wearing it. Overall, I really love this thing. It is a good all season piece, but don't expect hardcore warmth from it because it is fairly minimalist.

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I also have a Lowe Alpine light/mid-weight fleece vest that this is kind of replacing. It is not as warm, windproof, and takes up too much space in a pack.