The image is not affected in any way and also the function of the touch screen is not, it is just as sensitive as before, it is also angehmer to wipe over it than over films.
In principle, therefore, a good product but:
It does not really fit from all sides are missing 1-2mm to housing edge, which is why the glass is always clear sichbat and not nearly as unaffällig such as films, you can see at first glance that something sticks on the diplay because the edges clear are seen and the thickness of course fails even greater than in films. The recesses for the sensors which are not exactly in this area rugs, but above left quite a large rectangle is ausgesparrt, this effect is strengthened even more.
Therefore, lacking a star otherwise it's a good product, which certainly can be seen as an alternative to films, fingerprints do not form more than on other surfaces such as the display itself or even films.
It would be welcome if the glasses in the future would be something precise cut, but this is a purely visual problem.