In reply to astell:
Mine are five or six years old now, so maybe newer ones are a bit different, but I've always thought quite well of them. They've leaked a little at the knees on occasion, after kneeling on wet things for a while, and a couple of times got me quite wet round the rump - but it was pretty bad weather and I think the problem may actually have been with the jacket I was wearing.
I got them because they were 'the most breathable', a good length and a close fit, and haven't been disappointed on any of those scores.