Regarding the Soulo. It would be a good shelter, unless you have to carry it.
Totally NOT UL.
I know a lot of people don't have problem with a 5+ lb shelter, but I couldn't do it.
Some people love the idea of a dome shelter for winter use and all the heavy hardware that is required to make a dome work in the winter, but I'd personally look into another design.
A-frame, pyramid, tunnel and other styles give a better weight to weatherproofness ratio.