I finally picked up this bag. For now I opted for a different bag for my wife, she's quite short so we found for her - Snugpak Laponie junior, for kids
Attended an event on the weekend. 24 + hour event. -15C
Slept from 0500 - 0900 combination of Snugpak jungle bag, Snugpak Laponie, and Snugpak bivvi. Light blanket liner from home and some standard sleeping pad. No tarp or tent. Thermo underwear, fleece jacket and two pairs of heavy winter socks. Slept very well. Was impressed. These sleeping elements I didn't intend to use together, especially in winter, but don't regret trying them. It was not simple sealing myself up in all this though.