I'd been looking forward to reading West with the Night for months now as part of my 2016 goal of reading books 30 years old or older. I made the mistake of reading the introduction (why do they always tell you what's going to happen in the intro? maddening), and it was discussed that the story is partially fictionalized. Now, I really don't like my nonfiction to touch my fiction on the reading plate of life, so I put the book down in a huff. I don't think I've abandoned it for good, but I do think I'd rather experience this one on audio.
I was a little concerned that as I progressed in the Mitford series I'd find the books boring or repetitive, and I can't vouch for the whole series yet, but that's not true of the third one at least. If you're looking for a nice, comfortable, slow story that reads fast (and Christian themes don't bother you), try Karon's books. I'm very happy with them.