I felt lost a lot of the time listening to this, especially in the 1980s timeline. It was like we weren't being told important details of the story. It happened so much that I've decided it couldn't just be me, it must be to do with how the book is written.
Also, the narration of the 1600s timeline was stressing me out for some reason. 
I'm not enjoying it very much, so what's the point in finishing it?