i was looking for a bag larger than the the typical "mummy" bag...yet did not want to carry a lot of extra weight. this bag fits the bill. it is relatively lightweight (just over 3 lbs for the large size) , yet stuffs nicely in compact stuff sack, or the bag compartment of my back pack.
i used a liner, and it kept me warm in the upper 20's...not entirely convinced it would keep my comfy at 15 degrees without the liner. i believe this is a function of the extra room in the bag. just be aware of the temperature rating, and how it is metered.
the price is right as well since it is synthetic. down bags will always be lighter, warmer, and more expensive...but for the price, and the ability to let it get wet....this is the schnitzel! i love it.