The "installer" is as important or more than the actual tint product itself. Another overlooked biggie is "ease of installation" of the product. I'm not sure if these 2 factors had anything to do with your experiences but consider this, I have Suntek CXP 80 installed on my windshield for about 3 months now with no issues of creasing. The installer preferred this product as it was easier for him and his team to install it. This meant less time reinstalling later and more convenience for his customers not having to comeback as often. Just curious, which brand and product line did he install on your car?
The place I had mine done uses Solar Gard. Comes with a lifetime warranty. So until the windshield is 100% wrinkle free, I'll be taking it back to get corrected.