We're going to Australia for a few weeks and lonely planet guides are always the best I found. I'm actually Australian (!) and found this book extremely useful for information regarding travelling around Australia.
I bought this for my brother who is spending a year in Oz. The book is full of useful, up to date advice (this is the most recent version at time of writing Dec '13). There is a useful map, info about transport, places to stay and lots lots more. If you know someone going travelling to Oz you can't find a better gift. He hasn't put it down and was clutching it as he went through the airport! We all had a read and found out some useful facts.
I used Lonely planet for all my trips for the last 5 years, I understand Australia is a massive country and the trip I will do there cover lots of different places, but when I get the guide book I found all the places I am planing to visit but with just little information about them, so I had to do my research online to fill up all the missing information, such as transports links...which I think are essential. so yes lonely planet is this time it fail me or simply is no worthy to cover a whole country such as Australia in only one guide book.
Excellent, comprehensive travel guide covering the whole of Australia and real value for money (purchased for £8.00). The book is a little old being the 2013 edition and a new one is due for release in Nov '15 - but as we're going before then this book will do just fine. Particularly like the itineraries section - will be using these for inspiration when planning our travels.