I bought the 10'x10'. Set it up by myself easily. It is perfect for two Cabelas Alaskan cots, a small table, gear and a dog. It is completely seam-sealed and taped. I also bought the floor liner but left it at my son's house in Idaho
There is plenty of inside venting with the windows closed and of course a lot more with the windows open. The only "gotcha" in the tent setup is that you need to open the roof vents before you raise the center pole, otherwise you won't be able to access the rear roof vent (unless you are 7 foot tall or arms like an Orangutan).
The door is weather tight, but the tent needs a vestibule for you to be able to egress without the rain getting in. The door zipper can snag a bit, but I'm used to that. I'm thinking of crafting a small vestibule - it doesn't look like rocket-science.
This tent is as stable as you can stake it. I can see that it would handle some pretty nasty weather. It is 3 season rated, but I don't see why it wouldn't handle snow as I can't see how snow could stick to it. I'm wondering about trying one of those small catalytic heaters inside since there is a lot of ventilation.
I've had my Outback Lodge for almost 6 months now. I've used it in hot weather and was very pleased at how well it is vented. I just used it in some downright nasty weather (wind, rain, ice, snow) and the tent held up nicely. No worries about the tent's stability (although it is hard to sleep listening to snow & ice slide down the outside of the tent). It definitely needs a vestibule of some sort to keep rain from entering when you egress the tent. The floor liner is a "must have" option, not only for quick cleanup but also because any water entering will slide under the liner leaving the top dry. Since I use cots, water isn't a big deal.
I used it in mid-20's weather, and had some inside ice accumulation, in the lower corners of the tent. Moisture sources were two adults and a Mr.Buddy propane heater. After a week of below freezing weather, you'll have alot of ice build up.
Standard tradeoff - if you close it down to keep the cold air out, you'll trap the moisture inside. If you open up the large side & top vents you'll find it next to impossible to heat. You don't want to be rubbing up against the sides or you'll get wet from the condensation.
I need to make some sort of vestibule as an improvement. But I would continue to use this tent without fear in nasty weather. Simple, one-person setup and takedown.
Hope this helps someone else considering this tent