I bought a “good”/recommended kit from TP-Link, claimaing to be gigabit and couldn’t get more than 140mbps over it, even on two sockets on the same panel in the same wall. Then just to test it I even plugged one of the devices directly into the other and still didn’t improve the speed. I’ve been skeptical of those ever since. Fine in a pinch but not designed for speed. My wifi goes up to 600mbps so I’m massively better on wireless instead of powerline. Weird.