If it was 1991, this would be a very different review. It would go something like this: 
 WHAT THE HELL Stephen King!!!! This book has no effing conclusion!!! The last line might as well read, "Stay tuned to find out what happens to Roland of Gilead, Son of Stephen, in the next exciting episode of *ba ba buummm* The Dark Tower!" 
 I give it four star though because the story presented thus far is nothing short of epic. It's a work of genius, and I don't say that in jest. I'm absolutely loving this ka-tet. Luckily it's not 1991, it 2016, and I'm starting book 4 tonight. I've been hoarding my audible credits so I could binge this series.