Ed Malles wrote an answer about Big Agnes Pitchpine SL Sleeping Bag: 45 Degree Down on February 18, 2012
Write your answer here...I own the pitchpine here in Arizona. I find the temperature rating to be a bit low. I don't really feel comfortable in until about fifty degrees. The problem with the bag is that it's sewn through, no baffling, so there are cold spots.
But other than that it's a fantastic bag. I've taken to wearing extra layers when I go to bed.
I think the difference between the pitchpine and the WM bags is roomyness. I like a roomy bag, and that's what you've got in the pitchpine. I've tried the WM bags and they're pretty tight.