I've got the Terra Nova Space 2 and the Zephyros 3. Haven't used the latter yet, but I believe it to be similar to the Space 2.
I have used the Space 2 a number of times. It's a bit of a pain to pitch, and I doubt that it's rated for a windy night, but you can stand up in it, which is a great advantage. It's also waterproof, and the srt of quality that you'd expect from Terra Nova.