Product easy to unpack and set up (some care to center the window properly, the center is pressed with a finger and sticks without any bubbles).
I did as the recommended manual, bathroom, you turn on the hot shower qques minutes, cut when the steam has dissipated, dust and also can clean the glass without recovering ambient dust and therefore no bubble installation.
In a month of use I could test the resistance test, the phone is dropped from a height of about one meter, direct front window on a belt buckle, when I returned with some fear, nothing, not a scratch!
My Galaxy S5 and my clumsiness thank wholeheartedly that protection to 12 (when we know the price of repairing a screen S5)!
Product I recommend to buy eyes closed.