Staff approval note: eBook is fairly short, and is straight to the point. Goes through the basic method from start to finish, describes the process when doing the method, and that's about it. It works (personally have used it before), but only shows the run-through of the actual call. It does not broaden out, or go into very intricate detail. Has no pictures for the actual part of the book that describes the method, but it is well written and concise. Spelling and grammatical errors are noticeable, but not frequent. Good luck with sales.