I have a terra nova gortex bivi / tent (1 man thing) iI used it for the first time last month, spending a week living out of it. It is a little cramped as you would expect, but comfortable and more importantly, up in 2 minutes with 2 poles and 3 pegs, no leaks, and thanks to good ventilation, not much condensation. It weight very little and fit sin one side pocked of my Vulcan with space to spare....
I am looking forward to a bad winter so i can get out in the snow with it... should be brilliant...
Anyway my point as i am a little off thread (not exactly suitable for 3 people...); If you are considering a terra nova tent i would go direct to their website and see what slight second gear they have in. Mine is a second, but i cannot for the life of me see why (often it is just kit that has been put up at a show somewhere... afterwards, they cannot sell it as new and apparently they were ending up with large amounts of stock sat in a back room somewhere so they decided to mark them as a second then sell them on direct form their website). Be sure to read the warranty info though, as tthe seconds are not subject to the same bulletproof guarantee as the full price, "Firsts".
All the same, I got my tent for almost half price... so well worth a look.
G: