Got today my Samsung Galaxy S4 and delivered the envelope.
It is appropriate to say that the envelope is stuck and fits exactly on the S4, but the color does not match the pictures in the match. What appears on the screen after a rather gray shell with a black X, is in truth a black cover (same color as the S4) with a black X.
This can be seen as a negative rating point as my S4 but still looks great and the shell makes a solid impression and makes the phone slip-resistant, I forgive 5 star and a strong buy recommendation!