Now that I have read all four volumes, I feel that I can provide a more accurate review.
If you read all four volumes in the correct order, you will be presented with a simplified, graphic portrayal of China's long history in fairly quick and easy reads. Starting from the beginnings of times that at least were documented in some form up to the final volume that ends in 1912, you will encounter a rather comprehensive overview of significant points of Chinese history that changed the country over and over, sometimes for good and mostly for worse. If you have any interest in Chinese history, but do not want to read hefty books or have to select certain topics, this series will provide a decent overview.
However, China has an extremely complex and challenging history with endless number of important figures, along with groups that have invaded and ruled, and its geography constantly shrinking and expanding. While you will get that overview, you will also read through tons and tons of names, facts, and dynasties that can be a struggle to recall if you have no prior knowledge of Chinese history. I think reading these books is fun and can present to you a whole new world of history, but I would also keep in mind that it is only the barest of coverage. If you are truly interested in studying more Chinese history, you can use these books as a starting point for names and dynasties, then do further research on your own.