I have used the Llumar Extra film and it is 11.5 mils thick. It is nice for extra protection but it does come with some trade offs. I did the bed sides of a black Ram Dually. They are terrible for rock chips on the bed sides. The orange peel is more than the standard 6 mil window film. The biggest issue we came across was the deforming of the film when something does hit it. Most likely being on a black truck made it more apparent but there were very noticeable "white" marks from where it got hit by something. Granted it saved the paint but customers kind of see paint protection as I indestructible barrier. Also being so thick it does not conform as easily as the 6 mil. It has its place and works well in those places. Rockers, spats, fender flares, heavy equipment.