Since I have the case, I no longer agreed, except to see how easy / good it is settle. This is also no problem!
While this case is mounted, everything can be operated normally on the mobile phone / used. I have not noticed any restrictions. Even after removal of the Case I could no scratches or other discover on the phone itself.
I am completely satisfied
A small disadvantage perhaps: it contributes something on, say my perfect fitting case for your mobile phone will no longer fit.