Took a trip with a few like minded Bushcrafters to Southern VT in Jan 2014 along side Somerset Reservoir. The temps ranged from about -20 F at night to low to upper teens during the day. I got to use my new SO BC2 and SO large titanium stove. This is an awesome setup IMO. I had the BC1 originally and it was a nice setup but this new design is awesome!!! I highly recommend it.
I used ecobricks (bio bricks, etc) and they worked wonderfully. Tent stayed about 75 to 85 degrees plus even during the coldest snaps.
Here is a short video:
http://youtu.be/BXOC7m-Fbtc