Glass - Tint vs. Clear

I went to a GM dealer and had a dark,dark gray (almost charcoal) tint installed on the back and rear side-glass, the max allowed here, by law. The front side-glass had to be a little lighter, by law.The fronts you can't mess with,by law. IMO, and others, it's real nice, against the red(95 MonteCarlo),surrounding it.
I brought him all the glass,loose. I was charged $202Can,in 1999.
The selling point by the GM tech, was that it wouldn't peel, bubble, or color-change for something like 5 years. Well it's been on there for 16 years, and still has not peeled or bubbled. The color is slowly changing, but is still not far from original. The 200 was well spent.