Without a doubt, the case protects against scratches, which can occur easily when dropped especially on the relatively soft plastic corners of the S5. The corners are thus optimally protected. On the side Use the buttons (On / Off, Volume) are "Knuppel", which can be operated with the protective sleeve buttons; however you need it a lot more pressure than without covering. at all points with connections (side headphone, charger, microphone and IR, at the rear camera, flash, pulse sensor and speaker) corresponding recesses are provided so as not to affect the Funktionalitär. However, the camera and the pulse sensor are thus a potential risk of damage exposed during a fall. Unfortunately most vulnerable is the most sensitive display, which is only fundamentally protected by an overhanging edge protection against impact on an absolutely flat surface somewhat.
As luck would have it, but I fell in the outdoor area when pulling the phone out of his pocket from his hand and landed directly on the display on a gridlocked road. Result: the display is completely defect in a fall of less than 1 m in height. This can be expected due to the construction of the package and also on the price, but you should also know clearly before buying. I'm the product or manufacturer thus not blame, but others want it explicitly point!