A bit annoying is that take them from the color protection, as this is very closely "fused" with the black rubber sleeve. But this color is protective shell the necessary robustness.
At the headset input / Lightning connector / Mute key accumulates very quickly stubborn dirt. For this one must always remove and clean the casing, since the rubber is relatively thick, and is otherwise not rankommt properly.
The Lautlosbutton can be operated only with fingernails. For "nails Kauer" it is rather difficult because the switch is quite deep.
The most important: The power button is held by the shell, so that the "Rattle-gate" is therefore no longer a problem.
Statement Rattle Gate: Apple has learned from the iPhone 5. The button was the iPhone 5 at times so severe that the button was just hanging and the unit had to be replaced. When iPhone 5S Apple has made the power button loose.
The problem now, however, that right next to the camera, a microphone is installed. Due to loose power button and the microphone near the camera can be heard during the video shoot "rattle" button.