If you are looking for an extremely lightweight and waterproof jacket then I can totally recommend this.
I bought it a couple of months ago from Start Fitness for £45, and wore it for the first time on Tuesday.
There were light showers to start with then a good heavy downpour and the only place I felt slightly damp when I got home, was on the top of my shoulders. I was very impressed.
I normally find jacket sleeves to be a bit on the short side; i'm 6' 2" and they were fine.
The only downside I can see is if you go off road, tree branches, thorns etc might easily tear it as it is super thin.
Hope you found this helpfull.