As someone just getting started learning about the financial world of saving, investing, planning, etc., Roth's book was a great start!
After continuing my education a bit with other texts, I continue to be thankful for Roth, who explained everything so simply and clearly that I was able to grasp the basic concepts of investing, especially in regards to mutual funds, from the first page. His logic and reasoning made sense, and allowed me to start the conversation about financial planning with my family.
That being said, I don't recommend ENDING your education with the second grader book. In keeping everything simple, there are a lot of things that Roth wasn't able to add to the book - it wouldn't have been appropriate for this project! - so there's lots more to see and learn about.
To sum up - great start, clearly written, good basic rules and foundation for investing.