If you go with something like an A, you won't miss much. If anything, that boat will put you on your toes sooooooo fast it would make your head spin. An A cat will go uphill faster and at the same angle as any mono you've ever sailed. They are VERY agile and VERY tunable.

One of the things I noticed when moving from mono's to cats was the tune ability of the sails. There is soooo much more you can do to the rig on the water when compared to a dingy.

The tactics are similar but different. You have to make FAST decisions as you will be crossing boats at a MUCH greater rate of speed. You can never relax b/c be assured that nobody else is.

The mono guys always told me that cat sailors were not tactically good and just relied on speed. Well, that's not true. You have to be an athlete and good tactically. Speed is your friend, but if you're going fast in the wrong way... it's your enemy too!