While I don't have much experience with charter cats, I know they're the range - for good reason. They're spacious. They have a more upright stance for some folks that don't enjoy burying the rails on a monohull, and despite a wider tacking range, they have somewhat better click of speed which can get you from your lunch spot to your evening anchorage just a little faster. (and, we know THAT means your rum cocktail a little sooner, right?)
If you haven't seen what one of these look like, you should check out this video from the Moorings folks. Not exactly the way I would shoot it but it provides a nice little overview of the boat and it's many appealing aspects.