From a cognitive psychology perspective, it's an excellent way to learn vocab if you're a Twilight fan.

I would be amused if they took this a step further and published a version of Twilight where more long SAT words had been added. Better yet, it could be an e-book with hyperlinks to the word definitions. Even better still, the text could swap in synonyms dynamically so as to allow a good learning curve like a well-done video game or personal trainer would do.