IMHO, Chip buck is the only one I'd go to for a H20 main. We've done some testing with other sails he's made and I believe his work is second to none. Pintop or square on the Miracle 20, I think, makes no difference since you can depower the top so easily with the comptip (the only good thing I can say about the comptip). Class legal? Seriously, how many Hobie class races are you going to do anyway? Besides, he's the one who used to make them anyway.