I bought this book because I was curious what it'd be like to read a guidebook to my own country, as well as because I'd like to travel more within Australia. I'm a long-time user of Lonely Planet guides, but since I discovered that you can buy them chapter-by-chapter (for just $5), I rarely buy the full books.
I don't like how this book includes so many places that I can't imagine many people wanting to go - it'd be better if they gave more detail on the best places and left the others out (Rick Steves -style - his guidebooks are the gold standard, it's such a pity he only writes Europe guides). However, I do like that this book covers a few dangerous places (like outback tracks), I do like reading (a bit) about places I'll never be brave enough to go!
I think the coverage of hotels/restaurants/bars is a bit excessive but I do think that, even though this information is better (and free) online, it's good to have some such information within your primary planning source as a price indicator, and the hotel prices in this book are good indicators (they generally line up with the prices that are actually charged when you find a decent online deal - note that this means that if you don't bother to search for a decent deal you will have to pay much more than the prices listed in this book, particularly if you're unwise enough to travel at peak times).
In this book I found a few destinations I'd like to visit that I hadn't already put on my wishlist. I also found a few attractions I'd like to visit in Melbourne (a city I've been to quite a few times) that I'd never heard of before, but that wasn't the case for any of the other cities I'm fairly familiar with.
The hotel recommendations in cities I'm familiar with often line up with those I'd make, except that they generally exclude chains (chains can be a good deal in Australia, esp. at the budget end where they give a more consistent experience than indies). The restaurant recommendations also often line up with mine, particularity in my home city - I'm not sure if this means that I know about most of the good places, or if it means that the writers didn't bother to look beyond the popular places!
Books like this take time to put together so there's necessarily some out of date information here (one listed place in my home city closed before this book's publication date, and many listed places will surely close before the next edition of this book) but I don't think that will cause readers too many problems if they supplement this book with information from tripadvisor and google maps.