Without spoiling anything, I can honestly say that she is as good a writer as ever! The book really surprised me with its content and I had no idea where she was going with the plot at first. I was really frustrated that I couldn't see the thread of the story, but about a third of the way through the book I decided to just slog on and I was rewarded

I must say that if anyone other than JKR had written this book I would have never picked it up because it's not my style; which may be why it took me a while to get into it.
Overall I'd recommend it.