I'll throw in my 2 cents on the Kifaru tipi.
I have an 8 man with the packable wood stove. This is my go to tent for overnighters between September & June. The stove and tipi are small enough and light enough that I also bring them along on warm weather trips as a back up in case the weather turns. The tent(approx 8 lbs) and stove(approx. 7 lbs?) are light enough that they can be packed into the backcountry by one person.
Setup of the tipi is simple, basically stake down the perimeter and raise the center pole, although with something like 18 stake out points around the perimeter it takes longer to set up than a tent. The stove and chimney break down into an astonishing small and lightweight package. The stove and chimney take 15-30 minutes to set up, this really is the only down side to having such a compact package. I typically set up the stove only if I will be camped in one spot for more than one night or if it's really cold or shitty.
8 people could sleep in this thing but it wouldn't be pretty. With cots, myself, the wife, two dogs, firewood and clothes we're starting to run out of space. There's quite a bit more space without the cots but I can't see it being comfortable sleeping more than 4 or 5 people.
I have weathered some gnarly high elevation storms in this thing and it has been unaffected while any wall tents in the area were flattened. When you really get it going, the little stove glows red like it is melting and 4' flames shoot out the top the chimney like a jet engine. (The manufacturer claims that this is safe). I've seen around 10 pinholes in the fabric from hot ashes in the last 4 years. I just fill them in with the same silicon sealant used to seal the seams. A good tip is to make sure that you set up the tent so that the chimney hole is on the downwind side. I've been comfortable in short sleeves while it's 0 degrees and blowing outside.
The laundry line that runs around the inside at about 5' really is a great feature. You can dry your clothes/gear in a matter of minutes when the stove is going.
The only other down side aside from the setup time is the condensation that forms on the interior. The condensation is tolerable in Montana but I can see this being a bigger issue in other parts of the country. The condensation is only really an issue during and following a rain storm or if you set up on wet ground. I woke up in the middle of the night camping last month and I swore it was raining in the tipi. It after turning on my headlamp and looking around I realized that the hail that was coming down outside was bouncing the condensation off the tipi walls creating a rain storm inside. Everything got a little wet but nothing that the wood stove wouldn't dry out in 30 minutes.
As for functionality on river trips, I would consider getting longer stakes more suitable for sand if floating a river with sand beach camps. This could be expensive considering the number of stakes. I don't do many overnight river trips when the temp is below freezing so for the most part the stove stays in the raft just in case. It is nice to have it there though because it could turn a hypothermic epic into a good time. As long as the tipi is set up you will be warm and you will be able to dry out all of your clothing.
My favorite thing about this setup is waking up on a cold morning, rolling over stuffing a fire starter and some wood into the stove and going back to sleep. When you wake up next it is warm and cozy in the tipi and you can begin your day in comfort.