I've purchased this book elsewhere. But this is not the point. I will compare it to Giles. Much better, both construction of the studying material and exam question-answer part. Unlike Giles, NPTE has thorough explained question and answer choices, and an option of pausing the test. NPTE has three exams. Giles though has four exams and visually it is constructed very closely to a real one, little if any question explanation. Bottom part you'll benefit from both. But if you're short of green go with NPTE. Don't know the difference between NPTE 2008 and 2009 editions though. I'd be thankful if you'll provide that info.Thank you,PoleginI just had a look at 2009 edition. All that's been added is a color print, that is it. Test questions are the same.