My NBN experience: NBN connected (fibre to kerb then copper wire to house) - typical download speed speed 40-50 Mb Coaxial Cable internet then forceably disconnected - typical download speed 85-110 Mb So I got 50% reduction in speed from NBN and less reliability (the below-ground fibre to copper connection is vulnerable to interruption) NBN tells me I can get back to previous speed and probably exceed this if I pay a permanent $60/month (ie about 65% more) for fibre to premises.
I understand that this situation applies to quite a lot of people who had coaxial cable internet. ....and I believe the cost to the nation for this has exceeded $60Billion so far (or about $6000 per household).