Thanks Jerry. I have spent 3 nights in it so far. It is strong and sturdy - so no issue there. But I still get quite a bit of condensation on the cuben fiber parts of the tent. Of course, it doesn't drip because it's frozen but it is still there. The momentum isn't very bad at all, with barely anything on it. Kinda makes me want to make the entire tent out of it.
I'm beginning to think that, at least in my neck of the woods, a vent is useless. Even when I unzipped the door from the top (it's a 2way zipper) about 1/2 way, it still builds condensation. But being able to regulate the venting is nice though and I have no issue running my stove full throttle inside which really improves fuel efficiency.
As for the rain issue, winter's up here don't have rain. It's just too cold. Of course, I'm sure it would fair well for some light rain but I would bring a different shelter if temps were going to be close to or above freezing.