I had Llumar on my Dodge Avenger and from about May 1996 to April 2003 I had no quality problems whatsoever. It did get screwed up on the passenger side around 9/11 from me having a US flag thing clipped on there for a while (vibration took the tint off a bit), and that was my own fault. It came with a lifetime guarantee from the installer. Not sure about the specifics without pulling the paperwork, but mine was a sort of silvery grey tint that was more reflective than black (obviously visually but also heat-wise). There is a pic in my gallery that shows it. However, I would go black with any VX if it were up to me. As I didn't have the black Llumar (more subject to noticeable fade and can turn purple) on the Avenger I can't speak to that, but from my experience they make a good window film and I feel confident recommending it.
BTW, I used Advanced Auto Glass and I didn't think they were national but maybe they are as I've seen the same name way up north. On the Avenger the whole back and sides was only $100 plus $10 for a front strip at the top of the windshield. I'm thinking about doing the VX but likewise the window problem has to be corrected FOR GOOD first.