This model for Nexus 4 is of good quality, it holds firmly to the camera and fits perfectly in shape.
It does not move, and inspire confidence in the event of a fall.
The buttons are a bit more difficult to handle because the hull is not pierced, but it's still acceptable and prevents ingress of dust.
Some say that it's ugly seen aesthetics Nexus 4, okay that's true, but precisely, the Nexus 4 has a back glass (Gorilla class 2), but precisely in severe fall, it is double punishment, screen and ice back.
Good value for money