If no cell phone is in it, the Unbutton annoying to solve the mobile phone lock by loud whirring enormous. Each vibration in the car is transferred to it, because the part in the game mechanics and resonates. Really annoying! I have the button covered with a sticking plaster so that the buzz is gone. In addition, the mechanics of the retaining clip is shaky and does not make solid impression.
In my support I get very bad up to the button to lock screen. The volume control can only be operated with pointed fingers, because it is inside the parenthesis. The lock button directly above it, with my fingers I can hardly suppress.
Therefore 2 points deduction - which, other better.