I own the 16-man and love it. I use the largest Four-Dog titanium stove & stove pipe. If the outside temps are in the low teens it will heat the inside to the 60's. That's pretty warm for a tipi that's 22' in diameter!
It's MADE IN AMERICA which is more than most/all other tent manufacturers can say. Personally I think that's worth something. Kifaru gear costs a fair amount but what's your life and/or comfort worth on extended outings? It's serious gear for serious pursuits. But if you are planning something serious I can guarantee you will appreciate the quality and performance.
Remember that the Kifaru tipis will hold up to practically any wind or weather IF you get the perimeter staked out properly. The structural integrity is dependent on the center pole (already over-built and plenty strong) and the perimeter stakes. Get the stakes to hold and you'll be all set.
The photo below is from my 2009 moose hunt in the Wrangell Mountains.
John