Devolo dLAN 550 Duo Powerline + Starter Kit (550 Mbit / s, 2 LAN ports)

The device works very well. A unit is in the office under the roof, the second 2 floors below.
The unit also comes with the printer connected to the socket power supplies from 3 computers, 2 printers, AC amplifier, satellite receiver, television, Fritz Box, Switch, NAS and some other things, cope. (Before a bleats - the current load is in total under 6A)
A short test of the transfer rate (images of the NAS load) resulted in a transfer rate between 250-280 Mbits / s.
Transfer videos in HD quality and therefore parallel surfing no problem.

The only complaint is the very minimalist manual. It does what the images pretend and then - the only indicator, first red light starts to flash white, then red flashing to finally move into white steady light.
The whole process takes a little - here would be a little more helpful information.