I had a FF Snowbunting for years w/ a Dryloft shell and while the quality of the construction was second to none, it was only warm the first night. The deteriorating warmth was because the Dryloft shell did not breath well enough to prevent the down from getting wet-out from inside. So, I'd whole heartedly look at FF products, but suggest that you consider something with a very breathable shell. Epic may be an option, but I'm not convinced of its breathability. However, it's not a laminate which I'd stay away from completely. Also, I know that it was the Dryloft that was a problem, b/c my partner used to rock an old, old, EMS down bag with a standard nylon shell and after three days his bag had more loft than my overfilled 800 power job. It wasn't fun. Hope this helps!
Cheers,
MWienholt