The advantage here: The telescopic arm is adjustable in length and works perfectly well. Who is not 100% clean its holes for the screws in the wall unit will probably still have no problems to mount the arm, as he has through the telescope a little game.
Can turn to him - he is also light metal - but that should not be an invitation to do so, because due to the material it is also able to break very easily.
A total of 4 star. The money definitely value.