Speed?
One of our offices was moved to NBN's HFC network. The 12/1 plan at best delivered half what the old ADSL plan did and it only was close to 8 mb at about 4am. Others in the building had signed up for 100mb plans and also only were getting the same speeds as we were at the same times. Months latter, they still don't have what they are paying for. Luckily we could still sign up for a new ADSL service so we are now back to about about 21 mb.
There is also a serious lack of features on the HFC network. For example I don't know of an ISP that can provide IPv6 and a static IPv4 address yet. Some of use need those features.