This is the third envelope, which I have ordered for the Z2 ... and I let it now! Now I can also press the volume buttons and the on / off button easily, without me having to squeeze in between my fingers too high a margin. And all the connections on the other side are accessible, including the docking port (which I however not used). The shell feels very comfortable on (the back but did not really have a non-slip effect) and looks quite classy. Processing is in my opinion top. And they can be more easily solved than another envelope which I had used previously.