I can only say that when I received my first sail (2A Assymetrical chute) I was very impressed. The materials and workmanship were superior to North's. However the performance was a whole other eye opener: I felt like I was cheating. The sail had 80% of the combined range of Norths 1A, 2A and 3A and was very fast. It could reach higher and run lower (and faster) in the intended wind ranges.