'.com' or '.net' is certainly not something you should take offence to, on the other hand the word 'bigpond' is something you should maybe be a little embarrassed about, not the company per say but rather what you're likely paying for the service v's doing a little research on say 'whirlpool' first before signing on to such a service.
You mentioned that the quality of Bigpond was really good but that is exactly what Telstra wants people to believe, it is also how and why they sell themselves as a premium and expensive service.
Reality, however, tells a different story, there are actually MANY services out there just as GOOD/RELIABLE and actually far CHEAPER than Telstra. Bigpond/Telstra just hope their customers don't do the research and discover this for themselves.
Their customer service though I've found is the complete opposite of their network reliability, Telstra seem to almost have contempt for their customers.
Take for example the attitude Telstra have regarding new/revised/cheaper plans and services, they don't even think it is worthwhile to their existing customers to inform them of any new/cheaper prices, (or even better, automatically transferring them to the new/cheaper services) when they can continue to bill existing customers at the old more expensive prices/plans.
I've used at least three non-Telstra providers over the years who have ALL not only automatically switched me to cheaper options as they introduced them but have been far more COMMUNICATIVE, HELPFUL, HONEST, TRANSPARENT and COMPETITIVE than Telstra ever were when I used them. The speeds and reliability of the competitor networks have also been just as good and sometimes better than what Telstra have on offer.
Every Bigpond user is going to be doing themselves a huge favour by simply doing a little competitive research before re-signing on a contract that might be expiring soon or sometime in the near future.