In reply to AndydHart:
I have had the Ultra Quasar for 15 years and I love its sturdiness. I have used it for everything including summer backpacking, basecamping in the Alps and winter camping in Norway. But at 3.6 kg you can find lighter tents these days.
As it is worn out I am looking for a successor. For allround 4-season use the Hilleberg Nallo 2 is my favorite: 2.4 kg and just enough space for two. For winter use I might go for one with a larger vestibule like the Nammatj 3 GT at 4.0 kg - but then I will use a pulk.