Like the spec given, the heat rejection is not good. UV light is not big concern. It will fade or age interior but the heat rejection you must look for TSER (Total Solar Energy Rejection). The solar heat is more from IR and visible light spectrum side. The TSER of 40% is common. The ceramic tint has TSER of around 60%. The problem is some is so good at filtering IR that you cannot use Smart Tag through windscreen

Number can be deceiving. Unless products are from certain country like the USA, the TSER number, IRR, and others do not adhere to any standard because there is no world standard on these. The US at least follow the country standard in measurement.

The IR rejection above which is 90% is measured at 1400nm. The word heat gives an impression that the heat is block. If you look at the chart below, the 1400nm or 1.4um wavelength is at visible light frequency but the heat transfer through IR is beyond human visibility.

You will not notice the degradation of film performance. I think last time I used V-Kool that came with the car also like that. When new, felt very cool but over the years you might have gotten used to it. I think it is getting hotter too. I guess no matter branded or not, all will suffer. It is a matter of faster or slower.

So, if you have to replace the tint after 2~3 years, it still cost you only RM1400 and has coverage of 5~6 years maybe So, just give it a try