I have 3 car tinted with 3M crystalline. Quality is as per advertised very good. The only complaint i have is after 4 yrs or 5 yrs, tint coating will became blurr like swirl mark. Very obvious when driving at night. 3 of the car having the same issue. At 1st i was thinking its the windscreen issue but after look properly under the sun confirmed its the tint issue. 2 been replaced under warranty and 1 warranty expired. Tinted at 3M center so its not fake stuff. 3rd car i send for warranty, they dont event have a look already know what is the problem. Means common problem with 3M crystalline.