For dacron, should I consider aftermarket 3.9oz cloth, or the heavier 5oz? Is there a lifespan issue? If it was a square top it's not class legal, is it? I don't think I'll be competing with this boat, just cruising and having fun. Is the original Hobie sail the best, or just required for class legal events? Do the sails lose their shape as quickly as I have heard (1-2 years) and does it matter to anyone but the diehard racer? Here in Manitoba we have very very good wind, but lots of gusting (lots of days 30-40 km/h gusts to 50-70 km/h). My present sails are probably original on my mid-70's boat, time to update the boat a little.