I have the solar sunroof/Nav option and love it. I've already had to use the nav a number of times to pick up my son for friends houses, parties, etc. I have no complaints and I've had a sun roof on a number of cars.(all Toyotas)..never had a problem. My 2008 Matrix has a sun roof, has 131000 miles on it and sits outside most of the time. Never a problem.....
We have a three with sunroof and nav. We have gone on vacation to palm springs 115 degrees You could get in the car and lose the door without being overwhelmed. By heat. If you are getting white it also makes the car look much better