Just to confuse matters, I go the other way. I swear by Paramo trousers, I have a winter pair and a summer pair, and I find them really comfortable. Except in hot weather, when I tend to wear shorts anyway, they seem to keep me about the right temperature and above all, dry. As long as you look after them they last for years, Paramo will repair them if necessary, and when you finally give up on them you send them back and they give you 50 quid off a new pair.
I will do anything to reduce the weight I am carrying, and not having to carry over trousers, and faff about trying to decide how long the shower is going to last and weather it's worth digging them out and putting them on, is something I really value. Also, I don't find overtrousers very comfortable.
However, Paramo is a bit of a marmite brand. There will now be a deluge of responses for and against.