I've got a combination of powerline and wifi repeaters. Both TP Link. The powerline is for a network printer as it doesn't have wifi built in. The wifi booster is upstairs for kids bedrooms, but not sure if its actually doing anything.
Ive used the booster in another house that didn't have a working phoneline. I was picking up a weak BT Hub signal from across the road. The booster gave me enough to connect and use BT's public hotspot. Wasn't 100%. Needed reset a few times to get a stable connection... but that might have been interference, traffic, whatever.