NBN state is less than stellar, a vast majority of suburbs have no NBN at all, and a very small minority have actual fibre to the premise. Unmetered plans are becoming more common but are only "affordable" ($60-70 a month) at the lowest speed offering (12mbit). If you want unmetered at 25 or 100mbit, you're looking at 80 or 100 respectively, and that's looking at TPG and iiNet.