I was asking him for a powerful sail. He said, sure it'll be powerful; but just as important, he said, is to be able to flatten the sail and make it very streamline for maximum speed as the wind picks up. The sail does work well and has been versatile.

The only tangible thing I can see is the mini battens at the top of the sail in betwee the regular batten. He said these prevent any leech flutter and enable the best/most perfect flattening.