We're currently on Telstra Cable & supposed to be changing across to NBN HFC from about May
Not sure what, if any, change to expect - a few horror stories on Whirlpool about congestion, particularly in the evening, but most of my use is during the day so that's not worrying me, yet
One potential problem with the HFC NBN is that there's absolutely no battery backup, so if there's a power cut anywhere from the exchange, through the network out to your street, or just local, you lose all internet / phone.
They suggest using your mobile as emergency backup, but from the SA blackout last year, there are reports that mobile towers were also draining their backup battery's within as little as 30 minutes, then shutting down!
Starting to think more & more every day that Australia is going backwards, regardless of how much we talk ourselves up as a "Smart" country