Now after extensive use, I can say that my skepticism was largely groundless, as the benefits far outweigh:
+ Smooth shipping
+ The shell can be completely folded down to the back and is quite comfortable to hold
+ Beautiful Book Cover optics
+ The 2 slots on the inside (for credit cards, business cards etc.) are sufficiently large sized
+ Mobile phone is easy to mount, easy to detach again and keeps still safe
+ The magnet is sufficiently strong and will not open 'accidentally'
+ All the buttons, cameras and openings of the mobile phones are easily accessible (also camera and speaker on the back are not affected)
- Small drawback: the processing seems to me the low price to match. The plastic tray in the mobile phone is inserted is only adhered to the hull which easily accumulate dust between Holder and shell. With me the bond has already minimal dissolved in one place. However, it is hardly noticeable and can be easily repaired if necessary without visible consequences probably.
So all in all a good buy in my eyes. For protection against drop, however, I can not say anything because my phone with envelope has not yet fallen off. The protective sheath and their "spine" should be padded but definitely satisfying. In the open sides that are protected only by plastic cup, but I would not be so sure.