OK, this shouldn't be of much use here as this great product is no longer available and there are only probably 3-5 of us who have one of these products. None the less, I finally got to test this and here are the results in case any one is curious.
So, I got a Climashield Yeti style torso length UQ from Warbonnet last year. It came with what appears to be one layer of 2.5 oz/sq.yd CSXP sewn in. It also included another 3 layers of what are probably CS Combat at about 3.8 oz sq/yd. Last year, my son used this quilt on his first hammock trip, a week long trip to the Rockies. He reported being plenty warm with lows into the mid 20s-mid 30s, with wind/rain/sleet/snow, using 2 added layers plus the one non-removable layer. If memory serves, that weighed about 17-18 oz total.
Last spring, I removed all the extra layers. This gives me a quilt weighing ~9.5-10 oz, which is way more than warm enough for any summer temps in the south, and maybe even for most early fall and late spring temps. Last night I finally got to put it to the test.
WBBB dbl layer, WM blue leg pad, fleece jacket in the quilt's stuff sack under my knees, jeans and cotton t-shirt. Hammock pitched about 50-100 yards from a lake. No hat and a 25 year old summer thickness quallofil bag as quilt. I had no thermometer, I forgot it. It was maybe 60*F when I went to bed at 1030 PM. Based on surrounding weather stations, a low between 46 and 49*F, with mostly calm winds occasionally 2-5 mph. And 95-98% humidity. My wife and grandchild were with me, and while eating breakfast we all felt it seemed way cooler than any recent mornings, which have been in the hi 40s to lo 50s. Tarp pitched high and wide, no wind block to speak of.
I basically was just fine, but I feel I have established the lower limits of one layer of CS in this quilt, for me. Most of the night I felt toasty warm on my back. Around 4 AM, if I turned on my side it seemed like I could feel a sensation of barely cool in some spots, but on my back it was always at least neutral right on to 0700. A couple of times when the wind got gusty, I could tll the difference, but not enough to cause any real discomfort or interfere with sleep. It was when I woke up to a noise ( or to pee, whichever) about 0515 that I remembered I had a fleece hat in the shelf, so I put that on. Big difference, and I went back to what was probably just barely comfortable enough to pleasantly warm, and I got a couple of additional hours sleep before the tent folks got up and told me to get up( I could have slept another hour easy). Over all, I had a delightful nights sleep. (Side note:Which can't be said for my "refuses to hammock" wife, who was in the tent, with my grandson, on my thickest thermarest and woke up sore and beat up. She said she was awake about every hour last night and turned a thousand times. I also heard some complaints early on from the tent about sliding down hill, though we carefully picked the flattest spot around. Of course, my 8 year old grandson slept like a log. And said "this was the greatest camp out ever! )
So, I think I can safely say that this ~9.5 oz synthetic torso quilt will be bombproof, all by itself, for 55 plus, pretty safe in the field for 50 or maybe even 45( especially with warm sleep clothes like fleece). Which I think is pretty great. And especially if care is taken to block wind and of course rain. But I think anything lower than 45 would be too cold for me, especially with wind. Although, appropriate clothing and tarp coverage might get it a bit lower than last nights temps. Guess I'll call it a 50*F quilt to give a little reserve, and I would probably add a 2nd layer for forecast below 50, or for sure below 45. IMO, excellent.
BTW, the leg pad worked perfectly, I basically never knew it was there.