Having been issued pretty much every waterproof shell layer manufactured for British forces in the last 20 years, there is no way in hell I would part with my own hard earned cash for any of them. They are ok as issued kit, as a) you didn’t pay for it and b) when it is no longer waterproof (which is an inevitability) you can just get another one.
Best waterproof I have used is the Carinthia TRG. Not cheap, but that’s where I chose to put my money.