The Maserati was never intended to be an open top so wasn't engineered to give the structural rigidity required in the floorpan. Maserati would have launched the 2+2 that became the California instead. The GranCabrio was a rush job to satisy a market segment and has a ridiculously small trunk due to the cross bracing at the rear. The next generation of the car should be much better.

It's still the best looking car in the test and at this level of the market that counts for more. Interesting to note that the general public ignored the two German cars whenever the test team parked up and nearly everyone wanted the Maserati due to it's looks.