I agree with Woka. I have spent many a wintry night in Tasmania in all manner of tents and survived, but a decent 4 season tent tends to be an altogether different experience. I have had three Macpac Olympus tunnels in a row now, stretching back to 1984 and they have never ever let me down, no matter what has been thrown at them weather-wise. I have used my 3-season Mobi Garden 1.5 DAC (it's OK, I live in Shanghai and it's a Chinese tent, Cordura fly, weighs 1.8 kg & has a full mesh inner) in foul weather too and I'm here to tell the tale, but the comfort factor goes down somewhat, though it didn't leak. I had a very interesting night at Shelf Camp a couple of years ago in the Mobi, whereas the Olympus would scarcely have noticed! Had a close look at the Crux tents in London last year (
http://www.crux.uk.com) and the X2 Bomb (3.42 kg) may end up being my next 4 season tent. It's incredibly well made with really first rate materials; well thought out too, with a slightly larger vestibule than it's 'brother', the X2 Storm (2.95 kg). The Crux tents aren't cheap though, so there's the hesitation ... £540 for the Bomb and £460 for the Storm, but they are serious 4 season tents and you get what you pay for. The Luxe tents are everywhere here in China of course, as are almost every other brand found in Australia and then some. I was passing through the Walls last month and there was a chap camped above Dixon's Kingdom and he had an original 1974 Paddy Pallin japara A-frame, sans floor & mesh of course and not a zip in sight. I asked him if it was still waterproof and he said that he didn't know. There you go!