After installing the software Devolo Cockpit (from the homepage) arises between the adapters a transmission rate of 400 Mbit.
So far everything is going smoothly. Transfers between 2 Linux boxes run absolutely Ruckel and trouble-free.
The Triple-Adpater is awesome as can be connected to an adapter TV, Blueray player and linux box here. Interference from 2 adjacent hanging adapters are therefore eliminated.
The adapter go to standby, but are activated immediately after switching on the device.
Heat and noise (buzzing, whistling) I have not found.
The only drawback: Devolo adds only 2 network cables which also contain information on Cat 5e or CAT6. The price also 4 network cable supplied should be included.