Super light does the trick
This jacket is about as light as you can imagine.
I've found it to be totally windproof.
I also haven't found the limit to its water resistance even with prolonged rain.
It does not breath well, and so I find myself playing with the two-way zipper a lot as I climb and descend.
The material has withstood normal use, but I suspect any amount of crashing will do it in.
I give it the 5 star because its shortcomings (breathability and abrasion resistance) are expected from a super-light super-compressible wind jacket.