Due to big changes in my life, it took me almost four months to finish this monster of a book; and surely there were times it felt like a drag, especially in the parts of Venli's POV, the flashbacks, and most of the time in Shadesmar. Nevertheless, it was a great journey and somehow more mature than the previous three books of the Stormlight Archive. Also, I think it was the first book that the cosmere connections became more apparent (although I need someone to fill me up about most of them, because I haven't read a lot of the other cosmere books).
I'll give it a little time to sink in before I delve in the fifth book.