Pretty good book overall. Definitely start with the previous book – QBQ, which discusses the fundamental concept of making sure you’re asking the right questions to make forward progress.
Flipping the Switch takes it to the next level, though, discussing Application Principles that add to the QBQ. The application principles are Learning, Ownership, Creativity, Service, and Trust. Each section gives a relatively brief discussion of the principle, how it relates the the QBQ concept, and an entertaining anecdote to visualize the concept in action.
This is a brief book with simple concepts that should still help keep you more focused and productive in your work and personal life. Well worth the read.