In reply to LastBoyScout:
> in a known 30mph wind, it didn't budge at all, while more other cheaper and more expensive (but sometimes badly pitched) tents were flapping around like mad.
Yep - exactly. The reliability of tents relies massively on the experience of the user. If a tent is well cut meaning that the structure is taut, and it is pitched carefully accounting for wind, drainage, etc. a tent doesn't have to be particularly expensive to stand up in all sorts of horrible weather.
I owned a tent that looks very similar to the Argos one, that I got in Australia in 1992 for about 100 aussie bucks. It was brilliant and I used for hundreds of night for the next 10 years, it stood up to Ben Nevis storms that flattened a neighbour TN Quasar, to torrential rain in the Ecrin, snow high in the Himalayas etc. It didn't even have guy lines, but was wind-cheating and so well cut that it didn't need them. That design is based on the clip model of tents that Sierra Designs has been making for donkey's years:
http://www.sierradesigns.com/tents.display.php?id=14 It's a shape that works.
Having a good tent is great, but just by being really boringly obsessive about pitching it perfectly, you can get cheaper tents to stand up to a lot. Even fibre glass poles work fine in summer storms - they only become a problem in sub-zero temps when they can splinter. I have a three man dome for camping with my kids that I got for 30 quid from Decathlon, it stood up fine to a driving wind and rain storm in Denmark of all places, which was doing structural damage elsewhere!
http://lightfromthenorth.blogspot.com/2007/06/wild-camping.html
I think that modern tents, even at the bottom end of the market are being better and better cut, and that makes the biggest difference.