I know it's winter and the model X hasn't been out thru a summer yet, but can anyone conjecture how much the large windshield will allow heat issues on hot sunny days? I currently have an SUV with a panoramic sunroof that allows a lot of heat in during the summer and I am able to close the shade on hot sunny days. Is it tinted as you look upward? I'm really attracted by experience that the the openness that the large windshield gives you.