The popular and highly rated MH Kor Airshell uses a 20D Pertex Quantum Air variant. It has high MVTR and moderate CFM, which is the sweet spot that we usually want for windshirts. The Patagonia Airshed Pro Pullover uses a different variant of Pertex Quantum Air, and scored similar MVTR but high CFM, which makes it less of a windshirt and more like just a shirt with some wind resistance. We tested both in the Shell Game article.
AFAIK, the Katabatic Crest has not been tested. An educated guess is that it probably breathes well, but may not provide as much wind resistance as other windshirts. Ryan said that he liked his in the newsletter.
If you get one, please let us know how it works out for you. If you also have a Dooy, then it would be interesting to know how they compare.