Before starting the book, I looked through some spoiler-free reviews and ratings and boy, was I terrified of reading it. Many consider it as (one of) the weakest book(s) in the series and I may be one of the few who actually enjoyed it. Maybe it wasn't as good as some of the previous book, but it was still really good.
Like many others, Susannah isn't my favorite character. I've actually disliked her at some parts, specially for most of [b:Wolves of the Calla|4978|Wolves of the Calla (The Dark Tower, #5)|Stephen King|https://i.gr-assets.com/images/S/compressed.photo.goodreads.com/books/1419360231l/4978._SY75_.jpg|2754911], but I also didn't (don't) want her to die or anything so I was anxious to start this volume asap after the last one. I liked her better in this volume though I still preferred parts from Roland's and Eddie's POV.
Spoiler
Regarding the fourth wall being broken, it was quite confusing at first but then pretty interesting later. I liked the idea and unlike some, I don't think it was unnecessary. On the contrary, it just adds to the significance of the Dark Tower. The Stephen King in the book is a fictional version of our King, after all. Now that only one book is left from the series, I feel sad. On one hand, I want to finish the series because I want to see what's going to happen, but at the same time, I don't want it to be over so soon.