Not as bad as rated here ...

The outlet protection is not as bad as it is rated here.
The reviews can be seen that many simply lack the technical return policy.
For example, if someone judges the safety of these operations, claiming an outlet is only dangerous if you touch both Contacts, then is clear where the real weak point.
Equally is repeatedly criticized the fact that the protection is no longer closes after pulling a plug or the protection can be difficult to open. With a little technical Verständis should be clear quickly that simply the screw was tightened too much in these cases.

By the way is at the manufacturer's website the following notice:
WARNING: Not suitable for outlets following manufacturers: Jung, Gira, Busch & Jäger and Mertens. There only the socket guards fit for gluing or socket caps.

That this information is not passed down from Amazon is not the manufacturer's fault.

I have outlets from Gira (according to the manufacturer then does not fit the protection), the protection adapts wonderfully, All thing you have to get longer screws. The original screws of the sockets are then just too short.

All in all, one can not blame the manufacturer. Too bad that is not equal Reer offers longer screws for Gira sockets.