They repel heat more. UV protection is already at 99%+ with standard carbon tints, but heat repulsion is greater with ceramic tints. I currently have them on my car and can attest to that...that said, I will be going back to carbon tints as the SunTek ceramic tints have a blueish hue that just bothers me. Most people don't even notice it, but I do.
For the record, when I say "we" I mean Jonathan of GTH Installations, through me and my detailing business as an additional service. As mentioned in the other thread, Jonathan is still out of commission for a while, so tints and PPF are on hold for the moment.