Now Z1 Compact with tempered glass back ;-)

I got me this hard glass protection ordered because glass is harder and more scratch resistant than plastic film (positive).
In addition, here is a protection for the display and for back (to be ordered separately) to get equally from "Tempered Glass" (positive).
Amazon typical delivery fast (positive).
After receiving the goods, however, first confusion, because the packaging of the front and back are the same even if the labeling. Even on the back of packaging is talk of screen protectors. Nix power, just ask, I thought. Unfortunately, the times stated for telephone support were also flawed. (Negative and star deduction).
Ultimately, hard glass protection were identified for front and back, and much easier to install than a despicable film. While films can be rolled up and the correct position or may not be seen until after adhesion, the hard glass protection always remains flat and in shape. Phone put on the table, remove protective film from the glass protection and protection with both hands to align all four corners with the corners of the surface to be protected are superimposed. Now can be lowered and suck the hard glass protection slowly. All very simple (positive)