Totally worth it.
For the last two years I have developed the habit of Googling Westeros maps as I work my way through Mr. Martin's books again and again, and I am telling you the world is hard to make sense of on a smart phone screen. I haven't yet obtained my collection of hardback copies. I have all of the Game of Thrones books in audio and ebook formats. Starting next month, I plan to buy a hardback Song of Ice and Fire book a month. Had I done this earlier, I would not have as much confusion with the maps as I sometimes do while driving and listening to the story.
Anyway, I am anxiously awaiting my copy of The World of Ice & Fire: The Untold History of Westeros and the Game of Thrones (A Song of Ice and Fire). I pre-ordered.
I also just learned that J. R. R. Tolkein was a devout Catholic. How did I not know that?