Never used the Trisar, but have an old Quasar and a supernova, both great tents, although the groundsheet did start wearing out on the nova, but wild country (as was), actually replaced the whole thing free of charge. Doubt that would happen these days. From what i saw of the Trisar, it was a good one man tent, for 2 it could be a tad cramped, especially in grotty weather.
If you are looking to buy one mate, be warned that the older ones now could well be suffering from UV degredation, but it depends if it's only been used in the UK summer:umbrella:.