This is book is extremely readable - I found myself as engrossed in it as if it were a work of fiction, which is a credit to its readability. Good features include a clear breakdown of the various chapters into easily digestible chunks, a huge bibliography, comprehensive glossary and ability (of the author) ot see what issues are really important. For its size (about 250 pages) the book does an excellent (and largely unbiased) job of expositing the major (and contentious) areas of philosophy of logic. The only negative part is that too much prior knowledge is sometimes assumed, knowledge which I feel sometimes falls outside the scope of 'a first course in logic' which Haack explains is necessary to understand the book. However this is made up for by the glossary and excellent referencing. I feel this is book is an outstanding achievement and serves as a model for how similar introductory works in technical philosophy should be written. All together a very good and imformative read and amazing value for money. DJP
If you're familiar with classical formal logic and you're doing a course in philosophical logic (or you just want to understand it better) Haack's is definitely the best book to buy. In comparison Grayling's similar introduction is waffly and doesn't establish as clearly as Haack does what logic is and why we should care. Haack approaches philosophical problems related to logic from a thoroughly un-metaphysical point of view, which could potentially be a criticism as many courses in philosophical logic view logical investigations as a valid way of doing metaphysics (e.g. questions of the existence of propositions). Haack sees the discipline as analogous to 'philosophy of mathematics' but don't be fooled by the title, all of the key issues in a philosophical logic course are here, and in most cases are put in a more illuminating context than elsewhere.
Haack's book leaves you with a clear picture of the relationship between formal logic and philosophy, which is often lacking in other introductions to philosophical logic. As the previous reviewer said this is a paradigm text book.