Though not for the faint of heart (the size alone is enough to scare plenty of people off), this is one heck of a biography.
I admit it: I've been reading books by and about Montgomery since elementary school. I am a Big Fan. So, when I picked this book up, I was expecting a well-written, thorough biography, but I wasn't really expecting to learn anything new. Oops. I have new respect for LMM's grandmother, more sympathy for Ewan, can never look at my Page editions of her books the same way again, and am seriouscly scared by her son, Chester. Even more powerfully, though I've "known" her story for years, the bio is a page turner. Rubio sets the scenes beautifully and provides the kind of context that few biographies do. It's more than just a life story, it's social history.
A few minor quibbles--there were times where I felt like Rubio was trying too hard to prove a point (listing every letter that relates to a certain thing), and there were a few weird typos/editing issues.
Highly recommend for Montgomery fans or anyone interested in women writers.