I think anyone who wants to make comments on the advantages or otherwise of the curved foils on a boat like the F20, Should sail the boat before they put strong opinions out there.
As I am one person with time on such boats and also completed a lot of testing between identical platforms with only the foils changed. I can tell you that the curved foils are better. Sure you have to learn how to sail with them. Same as we had to learn how to sail with kites on cats... but would you go back to a non kite boat now??? For me the foils are as big a step as adding the kite was. Its seriously that much of a difference in the way you sail the boat.
But for Wayne to say that curved foils on a 20ft boat will make it difficult to sail is a rash and unjustified statement with no basis of fact or experience. We have some very "normal" customers sailing the F20 and its no problem for them to get the best out of the boat.