The foils are very good, they are not noticeable at all on the front or on the back and they do not alter the colors of the screen. They are somewhat difficult to install, but the installation kit helps, especially the spray if applied frequently on the fingers there are no marks on the sticky side of the foil. I would have preferred the foils to be thicker because I had a thicker one on the screen last year (2019) which together with the original cover perfectly absorbed the shock when I dropped the phone on concrete from 1.5m high and I didn't have any scratches; the thinner ones do not know if they offer the same level of protection. Anyway, I recommend it to everyone with confidence, it helps a lot to protect the phone!