The 46.3 is a great monohull!
I agree. With the extra beam and twin rudders it can be almost rail in the water and still have helm control. On our last charter we came out of an island wind shadow with way too much sail up. The wind hit us and we were flying, probably 8-9 knots SOG. I was on the helm but never felt out of control so we kept the sails up and enjoyed the ride.
The only (mild) complaint I have would probably apply to the new Dufour. The Moorings folks really don't know a whole lot about the monos they still have in their fleet. The staff member on our boat checkout didn't know much about the 46.3 but in his defense he got people out with the answers he didn't know.