Rating: 5 / 5
A very nice bag from an eminent manufacturer. The Epic fabric breaths well and is fairly water resistant to condensation. The full zipper version can be employed to make it quilt-like.
Feathered Friends makes 3 different 20 degree bags of increasing widths (Hummingbird, Swallow, Swift). I am 6 foot 2, 170 lbs and this middle sized bag is very roomy for a mummy style; should be suitable for those who feel claustrophobic in a more tapered model. The less constricted size also allows for layering inside the bag so as to not compress the down insulation.
Continuous baffles allow you to adjust the loft distribution, for instance, top to bottom for warmer weather.
If you want to spring for one good conventional bag that can handle a large variety of conditions, this is one to strongly consider.
The knowledgeable staff is very helpful in deciding what bag might suit you best. They will accept returns if it turns out to not be the bag for you and have been making bags since the early 70s for the worst conditions possible.