After much hand wringing, I decided to go for it and splurge on this top-of-the-line bag. So many strong recommendations from seasoned thru-hikers and backpackers that I knew I could not go wrong. It was a major upgrade over my 10 year old bag with the store-label of a backcountry.com direct competitor. That bag was listed as UL +10, but weights in >3 pounds and is really not much different than a 30-40 degree bag. In short, I twist, turn, and run cold in it a lot.
Used this bag for 2 night trial run up in the High Sierras near Devils Post Pile NM. It was great. Packs down super well, light enough for the bag, and lofts up super comfy for bed time. I am SOOOO happy I now have a right zip as well. As a lefty and right-side side sleeper, this was a HUGE plus of the new bag. Makes things so much easier and more comfy. Plus the zipper is great and really avoided snags so it seemed.
I have yet to test in cold weather, but trust it will work well. Got to about 45 both nights give or take. One night slept in shorts & T with light fleece top all zipped up. This was colder of the two nights and I was super comfy. Second night I was more acclimatized to the elevation and weather and ran in shorts and a T with bag unzipped almost 1/2 the night and used more as an open blanket. Again, VERY comfy.
I was very nervous as a side sleeper that this bag may run a bit too narrow. I tried some competitor bags that did run narrow and returned it. The only next bag was WM Alpine Lite, but that felt a bit too much and was a touch more $ and weight. I erred on trusting reviews of the bag from so many others. And found that despite being a side sleeper, the bag still worked great. I am 5'6" or so and 160 so not too big, thus the 6 foot bag was fine and even let me toss and turn a bit.
Also, even though teh bag does not have stays to keep in place on my air mattress, it did not roll around a lot with me. It held is position very well, which was also a huge added bonus.
The bag was paired with a 3.2R rated Thermarest Neo Air X Lite. Combined I may have had the most comfortable camping sleep in ages, if ever. It just worked.
I do have to be extra careful with the bag. It does appear sensitive. And may avoid using it for family camping fearful of my little ones jumping around on it. But for backcountry camping, it is the bomb. I am super stoked.
And I love how well it will pack down in my pack. I was only stuff into a dry sack, but not a dry compression sack. It still packed down really well and handled the pressure of my bear canister on top of if really well.
Super stoked. If you need a bag for the backcountry, this may be it. Very stoked for this bag. I know w serious TLC, it will last me a good 10-20 years of solid use.