Deal breakers

Again only interested parties. (20ft cat racers)

What are the deal breakers. what rule would you not be able to live with. and what boat do you sail?

I am not willing to shorten my mast or sail and not willing to buy an aluminum mast, I do not care if the class rules call for larger sail or mast but not shorter.

I'm a 20ft sailor, but don't think I have the bank to afford participating in an F20 class. I think the development class is great idea, though.

One design fleets have their drawbacks, but the money I save on equipment means more money available for travel to regattas.

What's the difference (besides sail area) of the european 20's? Why is the 18 so much more popular? Are Americans that overweight, or is the wind so much lighter here?