I use similar ones from Devolo and they are excellent. Slightly fiddly to set up the first time (well, mine was, as the code on the back of one of the plugs was wrong) but now we just plug in and have wired connections wherever we are. Enabled me to move my BE Box right next to the telephone cable where it comes in to the house, and got a speed boost from it too.
Though would not recommend if you have little ones, as its yet more wires to hide.