My apartment is about 20 years old, the connection goes through the whole apartment ...
T-Home Entertain works just as well as with cable, also the "switches" and record etc. go. So it is really recommended that you buy the WLAN Bridge of Telekom (150) for those who want to move than 20 meters of cable, or want!
I'm just excited about the 2 adapters!
Added: Even my Xbox 360 has no problems with it. Works well!