In reply to neuromancer:
So far for me Decathlon zips on the waterproof trousers and jacket i've bought from them have both had the zips malfunction on them, after approx six months use for the £40 over trousers, and approx a year and a bit for the jacket, first in the hand pockets and then the front zip for the jacket. They've had quite heavy use and been stuffed in and out of my rucksack a few times a week when i've been volunteering, but i'm not too impressed all the same. The RRP for the jacket was £70, I don't know if more expensive gear from Decathlon has better zips, but it strikes me as a bad place to cut costs if they do.
I think i'd perhaps buy Rab instead, the on one my then bottom of the range down jacket which is approx 8 years old has been faultless.