For me, not so relevant: "manual is only available in English and national language of the manufacturer, but not speak German."
Images are sufficient in this case.
Completely unnecessary is the bundled home button-increase. Two adhesive surfaces Black / White are included. These enable balancing between the display glass protection and the "edge" to the home button. However, that does not really fit this button. They stand on and were therefore not attached only.
These points are reason for me to give only 3 Stars.