Sydney. TPG telecom and its unlimited
I think it makes a difference how far you are from the exchange. We are only 172 m from TPG ADSL 2+ exchange. In general they have plenty if nodes around Sydney otherwise they wouldn't be able to compete with Telstra.
Here from my iPhone... A bit slower than PC but still alright. Device plays a role, android is a but faster. Best speeds are on PC.
I was on Telstra cable before and was achieving downloads of 15+ Mbps, but the price was too much. They were charging $65 for 12 GB. With that speed I was over my limit in less than 2 weeks. Add WiFi limitations this drugs the speed down