Read the letter with mine, says hooking up the modem and connecting is your acceptance of a move to nbn, which they then detect and move you over, but you stay on your existing connection albeit through the new nbn modem, until they move you over. You get an sms when that happens. So I'd say my brother is still on adsl hence the same speed as me. I usually get 15Mbps, 10-13 at higher load times.. So if nbn is anything over 15 I'll be happy, it's not like you get a choice in the end.. You can keep your existing connection but only until they turn it off for good..