I do not yet have the necessary perspective to assess its behavior in time but to summarize:
Packaging rich, the glass is well protected and comes with cleaning cloth, microfiber cloth and antistatic film and a squeegee so need to "rub" of possible bubble installation. Personally I have had no problems fitting, air fighter himself under the glass if you follow the instructions.
Tip: Work in your bathroom, run hot water so that the humid atmosphere make fall all the dust in the air. This will ensure flawless installation and without any bubble. Focus on balance, we must right the first time!
Perfect result on an iPhone 5S, OK compatibility shell SGP Slim Armor (the glass does not exceed).