I read this book mostly to review material I already knew - which is to say, I read Part I somewhat casually and skimmed Part II. That being said, this is definitely a book I wish I had read earlier - like, while I was learning this stuff in college. (Not sure how it is at other universities, but physics students at mine were never formally taught error analysis; we were simply expected to "pick it up" on the go. This is largely the way it was with statistical mechanics as well; as far as I know, none of us had taken a formal statistics course beforehand.)
Taylor wrote what was probably the most popular undergraduate textbook in the physics department (on classical mechanics.) The purposes of this book are different, but I find it equally as good. His pedagogical approach is to introduce the material as it is used in experiments and then justify the methods theoretically. (Most physics texts do the opposite: in some sense it is "purer" to do it this way, but it also requires the reader to connect the dots between first principles and results, results they may not be familiar with.) Certainly, there is some risk in delaying proofs (the reader may have a poorer grasp of what he or she is doing) but, personally, I preferred Taylor's approach. Educating his readers is clearly his first priority.
The book is also short - a good thing for this subject.