could be so good ...

A thin sheet of glass instead of a film sounds tempting.
Unfortunately, the fit is so-so (in my LG G2). The disc fits, but strictly speaking too small. It covers the display, but not the front and it remains a somewhat ulkiger frame.
There is a cleaning cloth (alcohol soaked) and a microfiber cloth case. The display was easily and quickly cleaned and the disk mounted. Sorry remained comic traces between display and glass (no bubbles), which have become less by applying slight pressure, they are not completely gone, unfortunately. And then unfortunately fell on the thick minus point: The brilliance of the display suffers. The colors are dull and the viewing angle is significantly smaller. In the point films are certainly a better choice.