This isn't a novel; it's more of a long short story or a novella. There's no character development; it's totally concept driven. And the concept is one that King has employed again and again, there's nothing new or original here except that the vehicle is a Kindle. He reuses the tower concept, too. It's obvious that this is the first installment of a several, and the tower will gain prominence as it goes along.
King should be ashamed to publish this tripe. Under the Dome was an excellent book in which King showed he can really write, and that he has insight into his characters. Not so with UR. It's as if he just has to write, regardless of content and quality.
Thankfully, the book was on sale. I'll be giving the future installments a pass.
You may get the rare happy ending out of this short story by Stephen King. It was also interesting that he brought back the mysterious "low men." I can't wait to see if they come back in another novel. It made me want to re-read "Hearts in Atlantis." I think I will start tonight!