I really liked how the story of Chapter House flowed on and referenced the history of the previous Dune books. Although the story did slow down in this book, I still found it a rewarding and satisfying read.
We can argue about this but for my money, Chapter House Dune is the best of the Dune novels. It focusses on the Bene Gesserit (their Chapter House is in the title) and it ties together many of the ideas about prescience and the power of the mind and body displayed by the Bene Gesserit. I will not give the plot away but I will say there are a few surprises to say the least. If you enjoyed any of the other books you can be guaranteed to enjoy this one.