I've been pretty involved in testing for years but it's never been a full-time job until recently. I was asked to take the ISEB Foundation Certificate in Software testing by my boss and this book is the one ISEB and the BCS recommend to go with the exam.
This was a very clearly laid-out book with each concept in bite-sized chunks. The authors clearly draw on their real-life experiences of software testing in the frequent worked examples. Overall, with the revision questions and exercises, it's a very practical book.
I used the revised edition, but there are still a few typos and a couple of munged graphics which could do with tidying up, but they don't detract much from what is otherwise a very polished and concise book.
I was able to take and pass this exam solely on the basis of studying this book, doing the exercises and revision questions and making notes.
If you're planning to do the same, I can thoroughly recommend this book. For the exam, I would also suggest that you concentrate on the "white box" techniques in Chapter 4 and do all the exercises in this chapter. Good luck!