I had Telstra up about their digital STB last week and got a reply to say that they are looking at other STB's that have better outputs but would not commit on when we might see them.
I will not be switching to Digital until they replace their STB with something reasonable.
While it's obvious there are issues with composite outputs on large screen displays and many of us on here could see such flaws the simple fact is that 99% of customers wouldn't be able to spot this.
When I get home I will post the reply I got but the message it gave was that they have had a LOT of negative feed back about the connection options given or more to the point not given.
As for the quality of the digital signal I would expect that to improve a lot when they switch to the new dish in September. Also regardless of the signal quality having a component connection rather then composite will still improve things no end.