Just wanted to create another post out there to confirm that you can easily use Netgear Orbi to be the main internet router on the iiNet/TPG NBN Fibre To The Premise (FTTP) service. You do not need to purchase another device to connect to the ethernet port on the FTTP NBN Fibre Modem.
Not only is it a great direct to NBN modem, but the wireless mesh is fast and reliable. No username or password is needed on the orbi, just plug it in, default values for VLAN tagging and PPPoE are just fine.
It even supports wired backhaul from the satellite to the main modem.
Indeed iiNet has now listed the RBK50 as a viable non-iiNet Modem for FTTP
She is working a charm at my place. In fact I am able to get very close to the theoretical maximim 990 MBps (yes!) when using a wired PC and the iiNet Ultrafast service. The web pages arrive *before* you click on them 🙂