I have the TL WPA4220Kit with four range extenders - all working with the occassional glitch.
My query concerns the labelling of the devices. Three of the extenders had labels showing a Device ID that differed from that displayed when I viewed the network using the TP-Link PLC Utility. The difference was in the last character of the four character ID, although one had all four characters different.
The labels are stuck to the bottom of the devices where they cannot be seen without removing the devices from their sockets.
It all seems crazy to me - surely these labels should be accurate and clearly visible.
The other TP-link Utility - 'powerline scan' seems pretty useless and only shows three of my five devices. They are only identified by their MAC which again is labelled on the bottom of the device and might well be as inaccurate as the Device ID.
When there is a power cut all the devices have to be unplugged and plugged back in again, otherwise random comms faults occur with both wireless and ethernet services.