Some feedback after my first trip with the quilt.
The supplied stuffsack is comically small--I imagine one could force the bag inside with a lot of grunting and a hammer, but I don't think either the bag or the stuffer would benefit from the experience. Simple solution: use a larger sack--a dry sack is best since it's down. Thus bagged it takes about as much pack space as a 30-degree down mummy bag.
For hammocking I found it much easier to get inside a quilt than my typical mummy bag. Pop the feet into the footbox after maneuvering over the two closure straps and pull the quilt up to the chin. That's it.
It's also easier to wrestle a foam pad into position when in a quilt because my arms are still free. Add the pillow and read or go to sleep.
The grosgrain under-straps aren't easy to adjust from inside as they fold over and jam in the buckles. I may experiment with thicker straps that stay flat; hopefully they won't dig into my back.
My "duh" moment came day two when I noticed the top of the quilt has a closure cord and toggle and snaps to enclose the shoulders. Now there's a good idea! Much of the draftiness I felt night one went away when I used the snap closure.
First night was near freezing, second night was in the low 40s and the third night was warm--probably 50+. I was a little cold night 1, a combination of not using the rainfly, not being situated correctly over the pad and not knowing about the quilt's top closure. The next two nights I added the fly, improved the hammock pitch to better handle the pad and used the top closure. I was perfectly comfortable and I even skipped the knit cap night 3.
In sum--for hammocking the quilt is easier than a regular mummy bag and I think is reliably warm to freezing (given some user education). I wouldn't (intentionally) try it down to the rated 20 degrees in a hammock without a serious underquilt, but hammock sleeping is very different from ground sleeping, since you're basically in a reverse convection oven. For what I paid, I think this quilt is a tremendous bargain. I'll try it for ground sleeping this summer.
Cheers,
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--Rick