Any time I have something that must be installed or removed, normally does not last as long. I get tired of doing so and just leave out or miss place in the garage and forget about it.
With a tint, as long as you clean it right, will last a long time if installed right and I do not have to do anything else.
Move to Tennessee and you can go 35% legally.
Can go lower as it is not watched very close.
Now speeding is another issue where I live!
Yeah there is one for the rear window in the set, i doubt i'll bother with that one though, they're mainly for keeping the sun off my son and i don't think the rear one will do much.
Keep an eye on ebay cos they do come up now and again.