It’s not bad, but also not impressive. If you’ve read other classic books such as “How to Read a Book”, then I think probably can just skip this one, unless you’re interested in learning some skills of doing book summaries.
There were some parts that were genuinely helpful, but his whole portion about the benefits of teaching a book was iffy to me. Though it made sense - Feymann's study technique shows that teaching someone else can help yourself to learn the content better, and I see how reading with the intention of packaging this information to others helps to let you read with more purpose and direction. HOWEVER it was iffy because his company was basically founded on teaching or speaking on books and summarising them for the audience, so it seemed like a blatant advertising effort to garner more people to work at their company / see how amazing the company's methods were. DNFed in the middle of that part because it was more of teaching how to speak on a book instead of how to read a book.
The author gave a very brief intro on how he reads books. Some methods might be useful. Some might not. I think this book gives a very good intro for readers on how to read deeply.