Well, I wasn't going to buy it, but I caved in and got it on my Kindle today. So far it seems fair to me. Overly wordy (three words I have never come across before, and I am an avid reader), a little bit pompous, but quite interesting. I think the presentation of Harry's character is enlightening. She's keeping the faux pas at Charles' 70th dangling like a carrot, and I haven't got to that bit yet. She's not a bad writer, just waffles on repeating the same points too many times and using 20 words when four would do.
I am not sure I agree at all about several things she's said about Diana which seem to be absolute nonsense.