I forgot one minor point. The Fly Creek 1-person versions have a design feature that always bothered me: the slope of the door and vestibule meant that, if you opened the vestibule when it was wet, any heavy moisture tended to drip inside the tent; that is, the drip point was positioned "behind" the tent door.

On the two-person versions, there's enough extra headroom and vestibule space that the drip point has moved outside the tent door, so the odd drips fall onto the ground instead of through the mesh onto the floor. It doesn't miss the floor much, and there still might be the occasional drip that hits inside instead of outside the tent, but the problem seems to be almost non-existent in the 2-person versions.