The build quality is just OK - have seen better but also worse. Meets definitely its purpose and should appreciate the phone. For 3 stars.
The main reason, however, I feel the shell as useless, is the same which was already called by JR: the supplied protective film on the display is pushed away from the rubber boot at all four corners and thus raised slightly (see picture). Thus this sheath is out unfortunately for me. 0 stars.
The price is also relatively high, 1 star.
Conclusion: who is using the supplied with the mobile phone protector, should stay away from this case. With no or other protective films it's a cool, but relatively expensive case, which should be adequate to protect the phone definitely good.