Have any of you BPL'ers given one of these bags a shot? I noticed them in a catalog not too long ago and have been a little curious. Compared to, say a WM Ultralite, they are about 7 oz heavier and, if the specs are correct, 6 ounces of that is down fill. WM claims 16oz of 850 fill, FA claims 22oz of 850 fill... both are rated as 20* bags.
I happen to own one of the Ultralite bags (as well as Alpinlite) and the ratings are pretty true so logic would dictate that the FA bag could rate at a lower temp. Also worth noting is that none of the WM bags I've owned, or currently own hit the weight spec dead on, usually an ounce or two heavier. So the weight difference of the two bags may be more like 5-6 ounces. Some of that additional weight on the WM bags could be overage of down, so also the fill difference might be an ounce or two less than I'm figuring, but still in favor of the FA bag.
The FA also sports a Pertex shell and enlarged foot box, which are nice touches. The price is pretty good too.
I'm not ready to give up my WM down, I'm just curious at this point. I haven't heard much, if anything, about these bags.
edited to add links: