I don't really know. I had for one winter a Peugeot 307 SW with a glass roof and there was the problem, that the moisture in the car went on the glass roof and been frozen over the night. On the next day, when you drove and the car getting warmer inside, the ice melted and water dropped on your head and on the seats.
Sure that is only a problem when it is really cold outside, but it would be an important point for me to think about.
Sure that is only a problem when it is really cold outside, but it would be an important point for me to think about.