" I thought it was too tight with 2 people. Hard to get in and out in the rain without getting everything dirty. . . I switched to a Trailstar. . . "
I agree it's not the greatest for two people. It works, but as you say it's a bit crowded; the single front entry setup with narrow tent just isn't good for two.
For one person, though, I don't see the Trailstar having any big advantage. I've never seen Trailstar in real life but entry seems to be just as cumbersome as SL2. Trailstar is wider, which is good for two people. But SL2 is fine with ingress/egress for one, you keep your pack and stuff on one half of tent -- or in front of your sleeping side -- and have one half as sleeping area. Plus SL2 has a door, which Trailstar lacks, and its smaller footprint may allow for more possible areas to pitch.
I actually think the Tarptent Stratospire 1 could be a good alternative. It's sold only together with inner so most people don't think of it as a tarp alternative, but I'm pretty sure just the tarp piece of the TT Strat1 is lighter than Golite SL2 tarp (I'm guessing 18 or 19oz without stakes) and has more usable space. There is room for two people to sleep side-by-side with no poles in between. Plus the Strat1 has dual side entries and a bugnet inner that complements it perfectly. SL2 is excellent in wind (and I expect Trailstar is even better) but I'm sure the TT Strat 1 is no slouch there, either. (I have the SL2 and the TT Notch, which is smaller version of Stratospire 1.)