There are several advantages that we can see in this book
1) it covers all four skills
2) it contains several practices for grammar, vocabulary, reading comprehension, listening comprehension and speaking. The writing practices, specially in American english file 5, are close to the analytical academic writing practices.
3) although the focus is on American English, you can understand the differences between American and British accent through some lessons
4) it contains videos similar to the practical English (basic, intermediate and advanced)
5) the topics of the reading and listening sections encourage students to talk and link the topics to their everyday life. So, they can be useful for practicing communication as well