Plugs were in great condition even though they have been refurbished. They are speed rated for up to 1000mbs but they struggle to get above 200mbs which is surprising and disappointing as my house is quite modern so the wiring is in good condition.
It's good. What I hadn't realise is that you have to plug your device into the socket to make it work (the signal is carried through the electricity supply), it doesn't work wirelessly. But as long as you do that, the signal is strong and I am able to use the laptop in the bedroom that doesn't receive wifi.
Once they are paired, they work as well as a standard cable connection, which is perfect when needing an ethernet at the other side of the house. Working brilliantly so far.