So far I have used this in Washington and Oregon in the spring. I have camped on snow (with a pad of course) with fairly warm overnight air temps for that time of year (30ish degrees F). This was MORE than warm enough for that as I left it partially unzipped to sleep comfortably. So I expect it will be just what I need when those temps drop even more.
This is my first down bag and the light weight and high compressability simply crush what I've seen for synthetics. The adjustable neck baffle is a super nice touch that I am excited to use in colder temps. The gills are also constructed well and easily slide even with the small zippers.
I couldn't be happier!
This review was written in the old system and had content requirements that are different than reviews written today.