This book is a fine textbook in many regards. It offers a lot of explanations, sample sentences, exercises, activities, and solutions to many activities.
If you do not know how to pronounce Basque, you will not find any explanation in vol. 1. (But you can buy "Beginner's Basque" by Wim Jansen, it comes with two CDs, with recordings both in natural speech and also with slower pace for listening and practice. Jansen's book is short and very introductory. White's textbooks are much more comprehensive.)
This book is described as if it were a textbook addressed to anyone wishing to study Basque. On the dust cover it is stated that "This is a good solid introduction to Basque." Unfortunately, the books seem to be addressed to younger students because the dialogues, sample sentences, and activities are strongly centered on Xurga, Goxo and some other characters who are vampires, werewolves, and witches. Therefore, if you do not mind studying with this kind of fiction and fantasy, consider these textbooks, vol. 1 and 2, as fine books that deserve five stars. But I find it annoying to have no choice but to practice with this kind of characters and vocabulary. I have studies many languages, ancient and modern, and I never came across such a textbook. A more general vocabulary would make these textbooks open to a larger group of people. I assume that this choice of vocabulary and topics was dictated by the age of students whom the author has been teaching Basque in Nevada.