KVerb, as to your earlier question about my experience with the Knot M Octo and weather - I don't have much. Haven't used it very much here in the forest. Bought it for 2p trips on exposed grasslands, which hasn't happened yet.
I didn't notice the 3F Hex pyramid (Canguan) on your list. I have been using that a lot with my dog lately. Great shelter. The sil outside/PU inside fabric is very solid. Not as fine or light as the high end fabrics of that type used by the big American tent manufacturers (Big Agnes, Nemo, et al.) but robustly coated, very water proof and seems durable so far. I'm not a fan of this pyramid for couples, though, because of the center pole. You can offset it to make space for two lying side by side, but it's not ideal. In addition, the inner is great but you don't get a dry entry nor a convenient fly-first pitch if setting up in the rain. For those reasons I favor the Knot Octo for couples - easy to set up the fly first and then hang the 2p or 4p inner after. And with the 2p you get a massive vestibule/living room and dry entry. It's true, though, that sleeping space is not palatial with the 2p inner, and only one door might rankle some occupants. But if dry entry is not a concern, the Knot Octo with 4p inner is truly palatial, and if footprint size is not an issue I would take it over the 3F Hex Pyramid - about the same weight, way more space, ability to lie side by side without pole in the way...
Did I see that 3F is making a Trailstar clone with sil/PU fabric? If so, I wouldn't think that works well. I think the Trailstar needs the stretch of silnylon to pitch taught. The 3F fabrics, with the heavy PU coating on the inner side, doesn't stretch much. In fact, for a nylon fabric it sags little in cold and wet; great for the 3F pyramid, but that lack of stretch might be a problem with the Trailstar design. (Could be wrong!)