I must preface this by saying I have only completed the first chapter. To this point, I find the material very clearly presented, with no errors. Gibilisco starts with the absolute basics, by describing the composition of atoms. He progresses into explaining atomic numbers, atomic weight, compounds, and shows how electrical flow is achieved by electron movement from one atom to another. He defines amps, volts (also known as EMF, electromotive force) and introduces ohms law. Coulombs are clearly defined and discussed, as are semiconductors. There's more, but you get the idea; this book builds knowledge through the logical progression of simple concepts, well explained and clearly illustrated.
There is a test at the end of every chapter. I've found the presence of a chapter content test to be a pretty good indicator of a quality self teaching text, and that's certainly true here. The tests are multiple choice, and structured so that 1 answer is correct, while another is *almost* correct... the result really makes you think, as another reviewer noted. The tests are open book, with a closed book final exam at the end of the text.
I should comment on another review, which stated that the first chapter test questions were not relevant to the chapter content. This is incorrect; in fact, every question in the first test can be answered by referring to the first chapter of the text, even the 'photocell' question cited in the review. It's all there; you do have to be prepared to read and study, but the material is all present.
If I had any criticism at all to this point, I would state that I find the authors writing style to be somewhat dry. (I think I'm going to ship him a box of commas, semicolons, and exclamation marks). However, the short, simple sentences may actually enhance learning... and this is a minor quibble, in any case. Just don't expect it to read like a Thriller novel.
I've encountered books in the past that started off wonderfully, and bogged down half way through. As I've only just started the text, I cannot state whether this will happen. However, the high marks given this text by other reviewers are very encouraging.
In closing, it's very clear that the author has exerted enormous effort to create a particularly well written and thorough self teaching text. This book was very clearly designed from the start to be a "one stop shop"... literally, all you need to learn electronics theory, all in one package. It has the capability to impart an in-depth knowledge of electronics to anyone who works at it. Most books aren't this clear; few books are this detailed.
But if other authors will follow Gibilisco's example, more will be.