Since the first edition of Ashcroft/Mermin 's Solid State Physics, the Condensed Matter Physics has been expanded a lot in all directions. Things like high Tc Superconductivity and Quantum Hall Effect were not even discovered in the 1970s. And even in this age, not many textbooks touched the areas that actually most researchers in Condensed Matter Physics are currently working on.
This book is a good try for putting all the new topics as well as the classical ones together in one textbook. But after reading it, I am afraid the book spreaded too much while most topics are not described very clearly in this small book.
My feeling is, looking at the content only, you'll find this a great book --- almost everything interesting has been included! But if you really try to learn some topics --- especially the "advanced ones" --- you'll find many chaptors just give rough ideas or descriptions and finally it turns out not that helpful.
But of course this is not a bad book in general. If you are not in the research of COndensed Matter Physics, browsing this book can give you an nice overview of the current Condensed Matter Physics.