Great review, I liked the comparison of space to the Double Rainbow.
I think you left somethings out:
It has the same weight only if you go with the lightweight floor option which isn't (as?) waterproof, and if you normally take trekking poles. The heavier floor adds 4 ozs., and two carbon fiber poles adds 3.6 ozs. (and how durable are these?). While I like the zippers over velcro, it doesn't have a porch setup.
Since I use the Double Rainbow as a solo and often don't take trekking poles, the weight saving is more important to me than space. So the other features would be a deciding factor for me. It would be nice to have both!