Everything about this book says quick knock-off. Its crudely written and often repeats itself. The author is often melodramatic and takes Wuornos' side only to admit later it might not have happened that way at all.
Its also a deception to call it My Story, passing it off as an autobiography. Wuornos was interviewed by Berry-Dee and thats all. The interviews arent worth much either, even the 50 pages of the police interview, included to pad it out.
If you've seen the movie this won't add anything new.
Avoid.