It is an excellent book. I found it very helpful for my tutorial preparation, writing course works and final exams. It contains all most important cases for this subject, gives facts on the cases and the most important extracts from judgements (it saved my time when I needed to find a particular phrase of Lord Denning or Lord Browne-Wilkinson, for example). Additionally, the book gives short introductions on each topic in the beginning of every section.
Of course, the book does include the cases only up to 2005, therefore, for more recent case law you should consult other sources of information.(Although you will not have to do it that often, as the majority of tests were established by 2004).