on the flip side of the coin:
as already described by others here: for laying the cable in the box they have to be kinked, especially if you want to run up and down the cable from the wall socket.
I have used them as a surface-mounted socket, have them mounted centrally over the hole in the wall, get the cable from the. In my case, the cables are neither performed nor sideways up / down from the case, but backwards. And even that was only with extreme bending (and breaking?) Possible.
The plastic housing is very thin walls, you should at the installation (and after) to be very careful.
The lid does not close accurately from the bottom part of the case, it remains a more or less large gap, depending on how well you manage the inner part (the metal block on which the cables are connected) to center in the housing, which due to the heavy cables to be laid in turn is not easy!
The lack of centering also ensure that the plugs of the subsequently connected network cable very difficult in / out ensures go. You have to press very firmly at the tuck before you hear "click".
The part is also no gap not necessarily a looker and I fear that the plastic is yellow quickly ...
I've managed to install the part, both ports are working (probably thanks to good cable quality) and because the can is not at a visible location, I can only once to live with it. Next time I would, however, pay a little more on quality and take costs into account.