For all your Australian TV listings I have found Shepherd to be great.
Two things to catch beginners out. The first is making sure the channel names match up with those set in the backend of Myth TV. These need to match exactly or you will miss out on channel information.
The other is to make sure you install it as the user that is going to run the the listing as the configuration and other details are stored in your home directory. In the case of Myth installed by apt on Ubuntu this means the installation needs to point to the mythtv user.