Lots of good information here. My mom was a diehard monohull sailor and we always joke that she is turning over in her grave that both my brother and I have bought catamarans. We own a Leopard 42, which is what the Moorings 4200 is. Some of my thoughts to add to the other comments...
Tacking is much easier on the 42 compared to the other catamarans I have sailed but nothing like the ease of tacking a monohull. Just make sure to have your speed up before you start your turn.
The new 42s are also now equipped with a camera on the bow to help you see your blind spot (the port bow).
A catamaran is, in my opinion, much more comfortable both at anchor and underway although you give up being able to head closer to the wind when underway.
I also think the 2 engines make it much easier to maneuver when docking and/or picking up a mooring ball. As a child, the engine on the boat we lived on seemed to conk out at the most inconvenient times, so the fact that you have 2 engines on a cat makes me very happy. We have had many times where one engine has died and it is nice to have the other engine to rely on. Although it is a whole different ballgame trying to maneuver a cat with one engine.
I do think getting into the dinghy is easier on a cat. The person can sit down on the sugar scoop and scoot into the dinghy.
And last but not least, having the "owner's suite" on the Moorings 42 is really nice! You have the entire hull to yourself and the larger bathroom is really nice.