works but not at the specified speed, umstän

I already have a starter / s had 500Mbit TP-Link and now wanted to expand on WiFi, I decided
again for the TP-Link series, I have two stars pulled off because the transmission speed in Powerlan and the WLAN does not comply with the manufacturer's instructions - to be honest, I did not expect, all manufacturers exaggerate because like with any measured in shielded laboratories values for my purposes, it is sufficient - another star had to leave because of the insufficient and written with super small print Inbetriebsetzungsinformation and the difficult, at least in my case, adaptation to the
existing network, there were some attempts necessary eventually worked the initial start-up only in direct outlet neighborhood (Power Distribution), then you could plug the adapter into each can still so distant and Powerlan worked - I was almost about to send the item back - but Now everything runs