The thread is too long already, many people already put review here as well. I also done tint bought from Groupon, brand CoolMaster, 90% IRR.
Great for 1st year, 2nd year onwards hot already. Compared to my other car, Wingard Royale, still works well but more expansive than Cool master

Try my brand, Bruxsafol, below 2k for Sedan, signal friendly. Quote on very high VLT, 75%, my TSER was 43%. Is lower then Vkool n 3M, but signal friendly plus the cost damage not that high.😀

Importantly, all film direct from German with laser homologation for quality assurance. Bad is, only at JB. PM me if you interest. Warranty at least can got to 3 years. Quality wise was stable, my car until today, about 3 years, still cool. After test for 3 years, we just decided to bring in.

Cost was attractive as we are direct from manufacturing.

I have a few tinted brands and can share u catalogue and pricelist , already pmed you yea thanks  . Special deals for lyn member .