It's hideously overpriced, and should be included with the BBG in my opinion, so I'm giving it a very low score because of that.
But that aside, it works well in combination with the BBG for protecting against a fair bit of wind.
It's easy enough to overpower them where I live on the coast, but that is to be expected.
Tip for use: Turn it inside out when packing it in your bag, and it will last longer, also it should help avoiding synthetic fur everywhere in your bag.