I have the 80/20 fibre.
I connect to a TV in the bedroom and a PC in another room using the Airport Expresses. The PC on a speed test is as good as my iMac – it is connected via the Ethernet port on the Express.
Wireless using either the Extreme or Express is running at 270-300Mbps.
I've not tested the speed as such on the TV, but it's certainly not slow! Downloading moves etc is fine. The Extreme handles ADSL and Fibre perfectly for me.
As was pointed out, the Extreme is not an ADSL modem
. When with a previous ADSL provider I used a Netgear DG834PN for the modem side of things.
Hope this helps.
Edited by belongabob (Thu 06-Sep-12 18:20:39)