There are lighter 20' bags to be had, and on the other side of that coin, warmer bags at this weight of about 1kg(2.2lbs), but wow, this is a great value for winter camping; or as someone's only 3+ season bag.
Using techniques here at BPL (3 layer sleep system, wearing your insulation clothing layer to bed, etc..) you could probably push this bag to 0'F, for $110!
A comparable Montbell bag is more roomy, a little lighter, but more than twice as expensive. Its really tempting to pick one up as a loaner bag for a companion hiker!
Anyone have experience with these?