There always has neuneux to say that it sucks also because they have not managed to put it right.
To paste adhesive must be clean and dust free environment. The iPhone must be perfectly clean and grease (glass cleaner and cotton cloth).
Then you place your film without taking off the protections, then you see how the best position. When you have identified the future location you check that no dust has settled on the glass. You can then proceed to the bonding of the film.
You can buy this movie with confidence and "icing on the cake" delivery is fast.