Panoramic roofs let a lot of light in and make a car more pleasant to drive. But they are obviously vulnerable to objects dropping out of the sky onto them. (This has happened to me.) Condensation isn't a problem on the roof because it doesn't affect your view out of the car, but the lack of insulation of the roof panel when the blinds are left open can lead to condensation on the windows. The answer is to always shut the blinds when leaving the car parked.