I love this jacket. It is nice and warm and puffy and light. I used it backpacking in the lake tahoe, ca region last weekend and it was perfect for the trip. It was high 30's at night and I wasn't cold outside the tent with the jacket on. As a bonus, it also makes a great pillow once you are in your sleeping bag.
Also, I ordered the large at first since it said it ran big, but had to exchange for the medium. Medium is normally what I wear so it was true to size.
My only concern based on other reviews is durabililty, but I guess I'll fine out. It seems fine new.