I have loved the book and the way that King has put everything together. Just the right amount of historical stuff mixed in with fantasy and a slight bit of horror (the Jimla in the back of the car!).
I have just got to the section where he has returned to 2011 after killing Oswald, found out that the world is strawberry floated and then gone back to 1958 through the toilet portal.
What I don't like is why King felt the need to make it that the change has caused earthquakes that "could destroy the world by 2080!". The political fallout and the fact that so many nukes have gone off (let alone Maine joining Canada
) should be more than enough to make Jake/George want to reset it, without having to throw in all the end of the world stuff.
And the resolution to the Yellow Card Man isn't great either, so they are Timecops who wear cards that change colour to show if they are mad? I was hoping for something better than that!
I still have a little bit to go though, hopefully it all ties together nicely, I just think King should have left it as JFK had to die because the world was worse if he lived, not because Earth will be shaken apart into another asteroid belt.