I bought this case for my Sony Z3 Compact. The alternative would have been a much less respectable Silicone Case (something I knew for my old Samsung S2 Plus - and the shell has the phone at a number of partly real violent crashes always saved.) And I wanted a nice phone in a nice envelope stuck.
Today my Z3c falls into the shell of not even half a meter on stone floor - and now is towards the whole display. You can see exactly where the blow came: right next to the one corner where this protective sheath surrounds the cell phone. The protective cover has not a scratch and the whole force of the impact has gone directly to the glass.
=> Yes so why do I need a Cover ?!