Positives:
+ Perfect fit
+ Slim, the case makes the phone not unnecessarily thick
+ Good workmanship
Negatives:
- Lid is closed not "locked" with a magnet or the like. The lid can be raised very easily, which is why the monitor often is inadvertently activated, the drop of the phone or when getting out of your pocket for example.
- The Fensterauschnitt does not exactly match the display on screen correspond (but is not so tragic)
- The contents displayed in the window are not configurable. However, this is no fault of the envelope, but the feature is missing in the operating system. Because you could have done more of it. Maybe that will be submitted for a possible update of EMUI.