I just used this product on my 2003 Subaru with 240+k miles. The headlight covers were completely fogged over and the resulting light projection was extremely dim.
Following the treatment, the lens covers were completely clear and I could easily see the reflector details from a few feet away. I haven’t driven at night so I can’t speak to an improvement in road lighting, but there is no doubt there will be a significant improvement.
As others have mentioned, it would be nice to have a UV protector included but that is nitpicking at this point.
Thanks for the tips,
Jay