"Disappointing"
There's a saying along the lines of "Being powerful is like being a lady. If you have to tell people you are, you aren't."
Paul Burrell spends over 400 pages describing innumerable instances in which he believed he served as Diana's faultless knight in shining armor. He repeatedly uses words such as "heroic" and "discrete" (!) to describe himself, which struck me as increasingly strange as the book plodded on. Also, Paul has a wife and family but yet states clearly that his loyalty was/is foremost to Diana - all day, every day.
It doesn't someone who's studied psychology (which I have, I should add) to realize Paul Burrell (and Diana, to be honest) have some issues. Most likely, codependency.
Don't read this book if you're hoping to learn a great deal about Princess Diana. If self-congratulatory butlers are your thing, though, this is the book for you.
"Sound premise, endlessly repeated"
I got through 75% of the book before I couldn't stand the author's repetitiveness any more. Though the premise of the book seems sound, I felt like I was listening (I have the audiobook) to the same chapter over and over. He even (repeatedly!) includes phrases such as "Like I've already mentioned..." and "As we've already discussed in previous chapters..." and goes on to restate essentially what he's already said. Bleh.