Well you've come to the right place to ask about that.
Here's a bit of light reading for you...
viewtopic.php?f=15&t=2831&p=29874&hilit=pants+mont#p29874viewtopic.php?f=15&t=5224&p=63348&hilit=pants+mont#p63348viewtopic.php?f=15&t=3574&p=40300&hilit=pants+mont#p40300These topics and the positive recommendations of other forum members enticed me to forego my long standing ritual of buying a pair of rainbird or 3 peaks overpants for just about every walk, and shell the coin for the Mont Austral Hydronaut ones. Very happy with them, so's my wife.
Durable? Well, for example. Sliding down off SouthWest Cape Range heading for Pasco Range, on my butt, down the steep grassy bank, over the top of the odd bush or rock etc... No damage. Sliding wasn't entirely by choice (but was fun, and saved some time and effort), I was overdue for a new set of boots and so I didn't have a lot of tread, so was slipping on the wet grass a bit.
Like any wet weather gear, you go bashing through Scoparia and you end up with many tiny holes so the waterproof-ness may not end up being what it should, but they will still be durable, and will offer protection for your legs.