This is currently the best overall guide to Indonesia for independent travellers. It covers enough attractions to keep people occupied for months, and is more than enough for those with an average interest in the country.
As usual with this series, it is strong on practical details like prices, public transport and city maps, though one should never forget that prices in particular will have changed by the time one gets there - this 7th edition was researched in 2002, and reflects the situation as it was then.
There is also more than enough background information about culture and history for most readers.
Note however that coverage of remoter, less-visited regions is poorer - the chapter on Kalimantan (Indonesian Borneo) is nearly useless, and the one on Papua (Indonesian New Guinea) is little better.
Those with a deeper interest in Indonesia, or with an interest in a particular region, might want more detailed guides to those areas - Lonely Planet has great guides to Java and Nusa Tenggara, while Periplus has eight separate ones to all parts of the country, though the Periplus ones are best backed up with this book for practical details.