In reply to Roger Vickers:
> Bit surprised with this cause your going to get wet wet wet if it rains. My Karrimmor running jacket does exactly what it say's on the bumf and it only cost a tenner from Sport Direct. Magic !!!!!!!!!!!!!!!!
There's wet, and there's wet though.
I went for a 2.5 hour run at the weekend in alternating sleet and rain. I was damp inside my jacket, mainly from perspiration (breathable is a scale, rather than an absolute) but was comfortable throughout, and didn't feel wet. With tech layers underneath this really wasn't a problem (it was the Salomon Bonatti).
I've got a 20€ Decathlon jacket which is ok in a shower but I wouldn't want to be running for hours in it. It would get soaked through to the skin, and cold. So while I agree that the more you spend, the more diminishing returns you get in performance, there is a sweet spot that is worthwhile paying for (around the £100 mark in my mind) if you're going to get the use out of it.