Rating: 5 / 5
I bought this quilt to use as insulation for ground sleeping down to 30 degrees. I received it a week ago and I've had the opportunity to test it overnight in my backyard twice.
The design couldn't get much simpler: a rectangular quilt made of 1.1 oz nylon with 2" no-see-um baffles full of 850 fp down. It also has omni-tape (like velcro but better) along part of the long axis and drawcords along each short axis. As a bonus, there's a slit in the middle of the quilt lined with omni-tape that allows it to be used as an insulated poncho (it's not waterproof though). The fabric is very pleasant on the skin. The construction appears flawless. The down seemed a bit clumpy at first but I've let it loft for a few days and it looks better now.
The whole thing weighs 20 oz and packs down small (7" cube if compressed). They include a silnylon compression sack but I don't plan on compressing it much.
The bottom drawcord allows you to form an adequate footbox. My advice is to also use the top drawcord to seal in the heat and avoid drafts. Pull the toggle out on one side, then tie the cord to the loop on the other side. This will act sort of like a neck baffle in a cold-weather bag.
I bought this quilt for ground sleeping. I was able to spend the night comfortably at 32 C under a tarp in the rain, but only once I optimized my use of the quilt. I wore a light insulating layer, thin balaclava, wool hat, and wool socks. I also loosely cinched the top of the bag around my neck as described above. I should also mention that I'm a cold sleeper. The quilt is wide enough (48") that you don't get too much cold air when you turn.
Overall, a good deal on a good quilt. The design is thoughtful and well executed. It's very versatile, just like the Jacks designed it to be. The price is good, next to comparable products. This will be my new primary bag for lows between 30 and 50+ degrees F. I'd say it's about as warm as an average 30 F-rated sleeping bag, if used correctly.
There is one improvement I would love to see on this quilt: one more small loop in the center of the quilt's left side. This would allow me to tie a cord across and cinch the center of the bag more snugly around me. I think that would improve the bag's temp rating further for essentially no weight. I'll make this modification myself on my own quilt.