Digital Marketing Excellence: Planning, Optimizing and Integrating Online Marketing by Dave Chaffey and Fiona Ellis-Chadwick is a thorough and detailed guide to developing and implementing a successful digital marketing strategy. The book covers all aspects of digital marketing, from developing a strategic plan to measuring and optimizing performance.

One of the key strengths of the book is its focus on a data-driven, customer-centric approach to digital marketing. Chaffey and Ellis-Chadwick emphasize the importance of understanding customer needs and behavior, and using data and analytics to inform marketing decisions. The book provides numerous frameworks and tools for conducting market research, developing customer personas, and mapping the customer journey.

Another strength of the book is its comprehensive coverage of different digital marketing channels and tactics, from SEO and PPC to social media and email marketing. Chaffey and Ellis-Chadwick provide detailed guidance on how to develop and execute campaigns across different channels, and how to measure and optimize performance.

Overall, Digital Marketing Excellence is an excellent resource for anyone looking to develop and implement a successful digital marketing strategy. While the book can be dense and technical at times, it provides a wealth of practical advice and best practices for digital marketers at all levels of experience.