The cover, which is supposed to act as a screen protector, can easily move (about 1 cm). The result is a corresponding gap between mobile and cover, the dust and other objects (such as keys in your pocket) to pass through. The result may well imagine any self.
Edit (27/05/2014)
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It was here probably a faulty batch, as I found out by calling the customer service. They offered me immediately, Flip Case, to replace the product with a new, error-free. Yesterday the part came in now and I'm very happy with it. For me, the (new) Case disturbs not when photographing, as someone wrote here. Maybe was also improved.
Conclusion: Flip Case very good and 1A-sales service, gladly again!