Mixed results have'nt proved them fast...yet. There is probably a wind window that would make them faster, but in the end, It's the skipper, and probably the sail design thats proving fast.
Although, on the catsailing DVD that came out a few years ago, Gashby says "the newer designed boats of today are probably 5 minutes faster around the course". Maybe the wave piercing design, maybe canted or curved boards, not sure what design feature he is alluding to.
Marstrom curved boards not installed $2000 not worth it to me, but if I was made of money, I would buy them!