as mentioned by another member in another post, the factory navi is (useless) compare to many of the smaller, more advance portable units such as garmin. they are more advanced, (touch screen, etc etc). you can take it indoors (hotel, etc) to do the planning and routes.
certainly it is not as 'elegant' and clean looking.
I have ordered a Garmin "nuvi 360" for a my 05 coupe. It should arrive in a couple of days and I will let you know how well it mounts. I have the built-in in the car.
As others have already said the built-in navigation of the Maserati is both useless and dangerous (like programming a street name with that dial while driving...).
Nicklaus Wirth once said that "deciding what not to put in (the design of ... something) is as important as deciding what to put in". Oh well...
I have used Magellan Roadmate 700 and Roadmate 3300T in other cars and they are both very good choices.
As M! remarked already the mounting and overall look may not be perfect, but functionality makes up for it.