One point that has not been mentioned......the boat MUST be exciting....it HAS to be able to SMOKE mono dingys of similar size/length (including Laser). Kids today are a bit more adrenaline addicted than even a generation ago. Add to that the fact that we (in most cases) are trying to pull kids from strong existing mono classes with a lot of family history. Even my own 15 year old has a hard time bucking all his friends to come sail on a cat....but he will IF it is significantly more exciting...but NOT "just" because it has 2 hulls.....(as an aside, I'm hoping to get him on an F18 soon...)