I approached Zinsser's book "On Writing Well" for its good reviews, and thus spent money and time on it. My opinion is that Zinsser went off topic; he exercised self-indulgence, lost sight of the topic, and delivered an auto-biography. I learned more about the author's life than his art of writing. The book is also a marketing operation; the main-matter includes extensive references to other works by the same author and his present business, so much that I felt an invitation to read those works and enroll in a class at the author's "New School" in New York, to learn what the book was supposed to deliver on paper! This is not supposed to happen, and I resent it. --- I read the book twice. The first time, to understand that much of it is needless. The second time, to spot the words of wisdom that are scattered in its 300 pages, take notes, and put the book away in my personal library. My reference book on the subject remains Strunk's "Elements of Style". By comparison, Strunk's work stays on my desk. I share Zinsser's own opinion that anyone serious about writing should read Strunk every year. I would say, read it so often to memorize it. I wish Zinsser's work were along the lines of Strunk's own, to complement it.