This book is an introduction to presentation skills, so it’s useful for non-presenters and novice presenters. Although the title says it’s aimed at introverts, in fact it’s useful for anybody who wants to get started with public speaking.
This is a short book – one you can easily read in one sitting – which makes it a good overview for putting together a speech or presentation. But, despite its brevity, it still contains valuable information if you’re new to public speaking. For example, in the section about preparing your presentation, Dix quotes from the book “Made To Stick”, by Chip and Dan Heath, and lists the six principles they recommend for making an idea memorable.
If you’re already a confident public speaker, you probably won’t need this book. But if you’re just getting started, it’s a good starting point.