The problem is that the tip so plugged into the socket and you can not pull out. Only through some tricks (beveled sheet metal screw) was to get through the good contact spring action of the (high-quality) jack, very stuck tip try more than one hour out again. For technically untalented would have a service case for the device, in which the adapter plugged in, run out.
I had bought several, and the other to show already at the train by the weight of the cable a slight bending which may then also can lead to a disruption of housing. I have disposed of those things for safety's sake.
Therefore thereof completely discouraged rather spend a few cents or euros more and (hopefully) get hold of a better quality.