Well, there's one very good reason to go on Telstra Cable:
I went back to Telstra Cable in 2010 after being on iinet ADSL since about 2002, because at that time the Cable plans suddenly became much better value. I've been on the same grandfathered plan since about 2011 which at the time was 200gb for $88. Some time in the last two years I think it was they upped that to 500GB.
I'm now on my fourth cable modem. First one was a Motorola dumb modem with single ethernet port which I used my Time Capsule as the router.
Second was a Cisco Cable modem. I used this in Bridge mode also with my Time Capsule.
Third was the Gateway Max mentioned above. This was the first one to support Telstra Air. It had some initial problems but was mostly pretty good, though it got very hot.
Now I've managed to get hold of the Frontier Gateway which is coming soon to the public (now, how did I manage that? probably obvious. This is where I stress that my opinions are my own).
The Frontier Gateway is actually an ADSL modem with a WAN port, and you get given a separate Netgear Cable Modem. This Gateway is obviously geared towards an NBN world where your primary access method might change (eg from Telstra Cable to NBN Cable which would involve getting a new NBN Cable Modem, or from ADSL to FTTN, or from ADSL to FTTP).
The big selling point of the Frontier Gateway is that is has built in 4G fallback so if your primary connection fails you can still use the web. I believe it will be available publically sometime in Feb.