This was one of the best book for inorganic chemistry, but this edition is very different from the previous ones. Many useful chapters have been done away with; they have been replaced with chapters rather poor, especially those about catalysis.
I advise the fifth edition, which is much better, even if it's quite old: the updates of new edition don't offset its flaws.

The 5th edition of this book had been compulsory reading during my undergraduate inorganic chemistry courses: it was the inorganic chemistry bible. This edition fails to reach the high standard of its predecessor. In fact, it isn't even a good advanced inorganic chemistry text. Much of the really useful stuff that forms the basis of an understanding of inorganic chemistry has been omitted in favour of niche topics. The book would be better called 'Advances in Inorganic Chemistry' or 'Selected Topics in Inorganic Chemistry'.

With this edition of "Advanced Inorganic Chemistry", Albert Cotton and his co-authors have proved that they kept track of all the recent developments in the field.
This text provides clear and balanced coverage, as it applies to Inorganic Chemistry. Every branch of the course was browsed, and with generous details too. In addition to the general principles and laws, there are updated information on: Atomic Structures of elements, Chemical Bondings and related associations; as well as Chemical Equilibria and Enthalpy.
Together with its insight in Nuclear Chemistry, the details this book provided on inorganic elements and compounds is worthy of praise. It is a fine textbook, which anyone who has the basic knowledge of elementary chemistry should be glad to read.