I just had it done 2 weeks ago. I cannot comment on the effect of it yet. There was no color change etc. I was going to do a write up on it in the next week.
My installer said not to tint the roof as well. Just like everyone he said it could crack.
If you live in a hot environment make sure to get ceramic tints to reduce heat gain. The make a big difference.
I just did ceramic, 80% front windshield, 35% sides and 35% back and rear. I did all thr windows for the ceramic. I didn't do the sunroof Installer said they break with thr tint. $250 for entire car.