I did mention Dark Tower - but since I've never managed to finish all the books, I guess the mention isn't worth much

. From the few (I think it was four) Dark Tower books I have read, I can say it is very much still Stephen King, so find out if you like his writing style before undertaking the epic journey (and be glad you don't have the epic wait that most King fans endured as he wrote the series).
I enjoyed all of 11/22/63 except the title (I'm not American) and the ending
. The rest of it was vintage King and very well done.
(Not sure if spoiler tags were really necessary, but better safe than sorry.)