I think I would agree with everything that has been said above.
I am a Maserati fan and was thinking of buying a Quattroporte (my first was a '67 model) and I am now considering a Ghibli.
I bought a bespoke Plus 4 because I wanted a classic design with modern mechanicals. I ordered to my own spec and for me aircon was important for our hot and humid summers. I actually started out to buy a Roadster but the 3 litre was out of production and I thought the 3.7 that would eventually be available was more powerful than I wanted in a trad chassis.
I am very pleased with my choice but miss the low rpm grunt of a bigger engine. I am seriously considering replacing the engine with a tuned 2.5 L Duratec which would give good midrange torque.
I understand that Williams have built at least two, a 220hp and a 280hp.