Seems like a good deal considering Optus are trying to sell you 4GB data for $40
1GB + 5GB bonus when activating a kit on a Telstra Pre-Paid Extra plan.
Photo of ad in store: http://quantumc.at/IMG_3299.JPG
Edit: Expires in 7 days so not THAT great of a deal but if you're away on holidays and your hotel doesn't do free WiFi it is still OK
6gb?