Here is another thread on the AT that you might find helpful. Shaped my decision to get a Greylock 3.
Excerpt:
Insulation (cold weather)
- Speer Top Quilt
- JRB Greylock 20
- Triangle Thingies from AHE
- Foam Footpad
Notes: The Speer Top Quilt is a considerably thinner cut than any other quilt I've encountered, which makes it very light and compact for a 20 degree quilt. It worked for me, but I realize it helps that I'm pretty small (5'6" and 150lbs). It left me enough fabric to pull over my head or tuck tightly around my shoulders and neck. Your mileage may vary. I absolutely love the JRB quilts. I have 3 of them at this point and I am constantly impressed with the quality. One of my hiking partners liked my Greylock so much that they picked one up at trail days and used it for the rest of the trip. I found the Triangle thingies from AHE to be the best, no-fuss way to eliminate cold spots and keep my UQ from sliding out from under me, they may not have been the lightest UQ suspension option, but they were worth the weight in my book. My coldest nights on the trail got down into the high teens. With my thermals and beanie on, my 20 degree insulation kept me warm enough. I always carried a chemical handwarmer just in case I had a cold spot, and I didn't feel like fiddling with my insulation in the middle of the night, but I only ended up using one over the whole trip, in southern Maine.
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