Very useful in either Range Extender or Access point modes with the ethernet port providing send or recieve. Have set a pair up to get a signal via range extender where the required building was on different phase of supply and then transfer that to a powerline adapter to feed in another building on that electrical phase and output a wi-fi signal there. Working well.
Easy to install and runs perfectly . Useful to use the app to find how good your upload and download speeds are around the house and put the extender in the optimum position with regard to router and WiFi receiver.