Both of her books are excellent and a great fairly quick read. If you have the time and really care about learning the stuff, I'd say read the larger book, and then review with the BRS book.
I've emailed her a couple of times over questions/ slight errors in the book, and she has always personally gotten right back to me very quickly to answer my questions, or whatever. Very nice lady, and very interested in making sure people get the most from her material.