I've been researching quite a few types of tints and although folks recommend the 3M Crystalline, I think I'm going to go ahead and get the FormulaOne Pinnacle® Series tint. I havent seen anyone using 5% on the back and sides....is there an issue with using 5% limo tint or is that a personal preference? I would like to use 3M Crystalline but I read that 40% is the lowest for that type of tint so 5% for me is darker and better. Also has anyone tinted the glass roof? Is that recommended as well? Thanks!