I never see much about them, but ive been comparing them to say western mountaineering (which gets a lot of love around here) for my one and only sleeping bag. Just curious as to y’alls impressions and thoughts if anyone uses FF sleeping bags.
Both FF and WM are interchangable in terms of quality. It's a coin flip. They're both so good I think it's safe shopping on price alone.
My winter backpacking bag is FF snow goose (-40F). My spring/fall bag is a WM antelope (5F). I've found the temp ratings to be accurate, if not conservative. After coming from years of synthetic bags and decent but middle-of-the-pack down bags, I was blown away by both. Of course, they're different temp ratings so I can't do a direct, apples-to-apples comparison. That said, my FF hood is a big more sculpted where my WM hood is roomy. Both work. And there's a slightly different approach to zipper snags with both.
If you care about such things, might be worth reading about stuff like pertex shield vs gore windstopper. Likewise 850 vs 900 down. I don't think the differences matter to 99.99% of us. I've used both of mine from Brooks Range to Rockies to Appalachians. No regrets with either.