I finished it and thought it was incredibly fascinating. My one thing is the last part was a bit harder to get through and I felt a bit like I was reading a dictionary but I understand if there was no better way to write that
I went out and bought mine today! I'm only 30 pages into it but I'm absolutely loving it so far and can't wait to read more. There is a spoiler warning in the book's introduction that new readers should finish the series first before reading it