4GB of data on 3G is pretty good. Nice to see a company that offers aussie support!
One thing I've noticed is a lot of people use their data package around the house or where there's free wifi like Westfield shopping centres. The best thing to do is set your phone to use your wifi network at home and then sign up for all the free accounts out and about. Saves the hassle of massive data bills and is often quicker than 3G.
Here's the deal info for Think Mobile Ultimate $39.95 plan:
Monthly Access Fee $39.95 per month Unlimited inclusions
Local and National calls, Calls to other Australian mobile networks, 13 and 1300 calls, 1800 calls, Domestic and International SMS & MMS
(excl. video), Voicemail retrieval
4GB of Data included every month!
Month to Month
Vodafone 3G Network