Bill:
I have a class-legal, almost-new main rolled up and stored in my basement, and a full-batten, Pentax main on my boat at this time, so I can switch between them if I so choose. In short, I'm not in a desperation situation regarding needing a new main. BUT, if I were to replace my main, today, I would probably look at high-tech kevlar string sail with the option of taffeta on one or both sides, simply for longevity. I'm experimenting with such a genoa this summer. Since most of my sailing is with a #2 on a furler (since I race light-handed, most of the time), I'm not strictly one-design. I have always believed in the concept of one-design, though, but for now, the PHRF option provides more enjoyment. If I sailed on the Chesapeake where the winds are lighter and there's a big OD fleet, I'd probably sail OD. I guess my point is, people are going to comply or not comply with the OD rules depending where they find the most satisfaction...in equipment and/or in the competition. Translated: People are going to purchase the equipment they want and where they sail.
Bob Rude