"Under the new plans, $60 per month will give a user unlimited calls and texts and 5GB of data to download each month. The new plans also include automatic data top-ups, priced at $10, which adds 1GB of mobile data to a user’s account whenever they reach the limit of their existing quota. A similarly priced plan at Telstra for $70 a month would come with only 1.5GB of data to download. Customers at Telstra can buy an additional 1GB of data for $15 per month."
http://www.theaustralian.com.au/technology/optus-mobile-plan…
The real game changer for me is the once-off $5 charge to add a data-only device (eg tablet, pocket hotspot) to the plan. I've held off on 3G for my tablet for so long because I couldn't justify the monthly cost when I could just tether off my phone. This changes everything.
Incidentally, how does Optus fare in the ACT? I was a customer many years ago in Victoria and service was acceptable but not nearly as good in rural areas as Telstra.