"Conservative Temperature Rating" - Review of Marmot Atom Sleeping Bag: 40 Degree Down

I used the Atom so far just on summer hikes. Last weekend I trusted the weather forecast too much (low: 43F). At 6am it was 30F, and I was wearing long johns, a jacket, and a balaclava and was really toasty in the bag. I belong to the guys who easily freeze. It's the first time I experience a bag getting to a lower temperature than it is rated. I get my Atom, 4-season Therm-a-rest and all my clothes for three days in the lower compartment of my backpack. This sleeping bag is pricy but certainly worth the money.
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