I don't normally read Stephen King, ever since The Shining gave me the willies, but I couldn't resist this one. Writers I know and admire were reading it, so I checked it out of the library. It's a real doorstop at 850 pages, and that is the main objection I have. He could have told this story in fewer pages, in my opinion.
I do like the idea of parallel time strings, harmonizing the past with the present and future, and a reset button for the past. As a writer struggling with a time travel novel of my own, King's craft kept me turning the pages. His trademark creepy stories are a subtle minor key in this overall saga about what happens when we play 'god' and attempt to rewrite the past, for ourselves and the rest of the world.