I suspect most of the purchasers of this book will be those for whom it's a course book recommended by your lecturers. However if you're wavering over committing the money or you just want an interesting critical thinking book which goes a bit beyond the A-level I have to say I'd recommend this. It's as concise as it needs to be, simple to understand and covers all the areas it should cover, what more can you ask from a textbook?
This book is an excellent read and a must-have for anybody studying Critical Thinking beyond the AS-level. It goes deep into all aspects of Critical Thinking, and provides activities (with answers) as well as an extensive glossary.