I've had the Jura 2 for a few years. It is by far the best sleeping bag I have owned, and I've been a camper for over 60 years. Super durable, and very warm. I am a cold sleeper, so I find that I start getting cold at anything below freezing, but a good bag liner and some good thermal base layers gets me toasty down to well below. If I am car camping, or on my boat, I also take a light down quilt, which cures any amount of cold. The top zipper is awesome. It works great in a hammock, but it's very convenient in any camping situation. There are lighter and warmer bags out there, but for the money I think it's a crazy good piece of kit.
I love seeing Americans accross the Pond using home grown British products. I use a lot of American ultralight and down gear too. I'm 6'6, love the jura 2 when I know its going To be really cold and I just want to be warm no matter what.