The KabelBW port located in the basement, an office also, while the second study is under the roof and in between we also "gotten" by laptop or smartphone slightly network want.
My installation looks like this: On KabelBW modem Fritzbox 7050, which merely acts as a router depends (sooooo important in this combination: disable Traffic shaping!). Because a devolo dLAN 200 AVplus, so to speak, "into the grid," integrates the network. The computers in the work rooms are also connected via devolo dLAN 200 AVplus, additional devolo dLAN 200 AV Wireless N, if necessary, put somewhere in the house in the socket when WLAN is required for mobile devices.
The installation and setup was using the devolo software (only for hedging purposes and means of the WLAN you need) super easy, the network is completely stable and fast from the basement to the second floor. Unlike the Fritz box - Repeater - solution I had earlier, a real asset!
Hence my conclusion: These adapters are certainly not the cheapest on the market, but very reliable, easy to set up, low energy consumption and especially you can continue to use the socket. I would do it that way again.