Thanks for the compliments. We haven't used it yet (we have plans for next weekend), so I don't know exactly how warm it will be. I would guess, based on accounts from others about 2.5oz apex, that I will probably be warm enough under this quilt down to the low 40s, but my girlfriend will probably be comfortable to a minimum of 50. So, for us, I expect it to be strictly a warm-weather quilt.
Barry, I haven't seen a design like this before. I considered other solutions to the draft problem (two integral "hoods", for example), but this design (which reminds me of the butt-flap on old-fashioned pajamas) is the most versatile. We can pull down the draft flap and don hats or balaclavas on unexpectedly cold nights, or flip up the flap and wear nothing on our heads on warm nights. I'll post an update once we have tried it in the field.