Hi Bob,
When you talk about the NBN service are you talking about Fibre to the premises (FTTP) or Fibre to the Node (FTTN)?
I'm in an area where we are currently about to be migrated from ADSL2+ to FTTN.
When the works first started I experience real problems with home broadbank due to remedial works being performed on the old copper lines.
Those works are completed now and although we are still waiting for the NBN to be turned on my download speed is currently 4Mbps.