Most of what I was going to comment on has already been said so I'll forego a repeat here.

I researched several brands before I had my clear bra installed. 3M was only warranted for three years against yellowing. I planned to keep my car a lot longer than that. I settled on the Lumar film. It has a lifetime warranty agains fading and/or yellowing. So far, after a year, it seems to be doing Ok but that's still pretty early in the life expectancy. We'll see......... <keeping fingers crossed!>

Drive Safe,
Steve R.