Next point: The supplied films.
The envelope will be 2 protectors for the front. These are well-made, the notches fit exactly on the small camera lens, speaker and home button.
All those who had not yet have "experience" with such films said that you should hang up the film in a completely (or at least possible) dust-free environment. Prior to placing the foil, the iPhone is to clean with the microfiber cloth, then hang up the film. Despite cleaning are still lint or small crumbs on the iPhone form at these locations unsightly blisters that do not can be customized with the included cards badly to push out. If an attempt is then deducted the film again and reissue, the lint depend on the film and you have the mess (like me ;-)). No problem, because there is still the 2nd film. With it went well.
Generally you should try the foil from the outset hang up so that no or few bubbles. Has the less trouble you then to the Slide Out.
Although I think that films are not absolutely necessary, because the processed glass of the iPhone is fairly scratch resistant, but better safe than sorry.
Also suppose the supplied "plugs" mentioned for the data / charging cable and the earphone jack. These are precisely and can be used easily, therefore. Removing the protective caps is unfortunately associated with something "Gepule", but should nevertheless not cause any major problems.
All in all, a visually attractive and well-made Case for iPhone 4, which I can definitely recommend it. But there 5 *!