Installation is easy, it just requires a bit of attention to avoid air bubbles few (very few), but 1 minute it's done!
The protection does not interfere at all reading the screen. It is as if it did not exist. Yet it is there, and it's not just a sheet of cellophane as the original protection when unpacking the unit but a thin solid film that will protect well indeed your screen.
This is a pack of 6 protection comes with a small soft square of cloth to clean.
Over the life I do not know yet, but I think with 6 protections be quiet for a very long time and all for a really low price.
I recommend.