I have the sitka one (dutch oven) and when its 6 degrees in the stand I am proud to have it on. Its is typical sitka quality and it has 3 heat settings. On high it will roast you for about 3 hours. I rarely have it set that high. The low setting radiates heat across your core and keeps you toasty, but when it does get real cold I will wear it as a layer and bump it to level 2 which lasts all day. Extremely lightweight, soft , and quiet as most sitka is.
Plug it in each evening and its good for another day. I can highly recommend mine and when I am hunting in Canada, or anywhere cold you can bet I will have it on