The consequence is only once little dramatic. Before one would open devices connected to it, you should unplug the power cord anyway.
And the shutdown itself works without the phase tester-action or plug turning.
Schade is nevertheless that it has missed these manufacturers to deliver a good product around. A high-quality two-pole switch, which would have also been specified with 16 A, would work lasting even at full load 2000-3000 assure W, and additionally some lightning protection during power disconnection. However, a so-equipped part would be more expensive for sure, as well as greater.
This leaves a very favorable indeed switch, especially in the weaker consumers in the range below 1000 W can be used for good dressers shutdown without always pull the plug from the bar. If the part is not heavily loaded, and does not forget in the maintenance of downstream devices that you have with the shutdown does not necessarily separate the phase, there is nothing against this adapter.
And the pleasing small price helps to amortize the investment costs by example. Savings of standby losses quickly.