Regarding the installation of the product I applaud with 2 hands. When it is complicated to put plastic film that is extremely easy to install: Simply clean the screen to remove any dust. Then you take off the protective film. Finally you align the glass screen with the holes for the front camera and the home button and release you. It'll just remove 2-3 small air bubbles with a loyalty card card type.
The screen itself is discrete and does not change the sensitivity of the touch.
I am satisfied and I recommend this product.