Mudman,
Nothing is wrong with a cat loads of fun just not the best choice when learning the sport. It's probably best he learn on a simple mono-hull then maybe move into a cat. As a former cat sailor as you get older all that high performance isn't always welcome. Especially when your body doesn't bend and move like it used to.
I'm guessing from Kevin's original post he is looking to gently cruise along with some friends relaxing sipping a cocktail before he kicks the bucket. vs. being strapped up to a trapeze flying a hull in 8 to 10 knot winds.
