The master course on competition law that is taught at my university relies primarily on the relevant legal sources (the Treaties, regulations, Commission guidelines, etc)--not literature. I felt that I needed a book that provides me with sufficient background information on any specific issue; the more comprehensive, the better. Jones and Sufrin satisfies this need.
The book is very comprehensive and covers not only competition law itself, but also the underlying political, social and, in particular, economic concepts and rationales. It relies heavily on case law and additional sources, but also takes legal practice into account, which makes it sometimes less academic (and perfect for my course). It is also one of the few of its kind that is up to date and `Lisbon proof'.
However, I should point out that the structure is sometimes indeed very confusing, as pointed out by another reviewer. For example, there are chapters that almost exclusively deal with the competition policy per branch (e.g. collusion and abuse of dominance), whereas others deal with the notion of cartels and oligopolies in general. In the end you might have to read multiple chapters in order to fully grasp a specific legal concept. Moreover, the chapters do not seem to be ordered in a logical manner, so you actually have to take a good look at the table of contents.
What disappointed me the most is that the book has no chapter on state aid. Instead, the chapter is provided electronically (PDF) via the Online Resource Centre. It took me a while to discover this. Frankly, I find this unacceptable. When I purchase a book, I expect it to comprise all the relevant chapters so that I do not have to rely on my computer or have to print it out myself. State aid is an essential part of competition law and should be in this book.
To conclude, I can definitely recommend this book if you are looking for a comprehensive, up-to-date book on EU competition law. I primarily used it to look up specific concepts but have not read entire chapters. For the confusing structure and the lack of an important chapter, I subtract one star.