If you are talking about 3M Crystalline that stuff is pretty great. It runs more expensive than regular tint like 3M color stable, but the heat rejection properties are awesome.
Material cost more, its harder to work with, so I would expect higher pricing, but I have found some shops that have reasonable pricing.
I use it on my desert trucks because I dont want dark windows for night driving, and really need that heat rejection during the day. Clear 90 on the windshield is awesome... cant even tell its there, and it makes a massive difference.