So finished the main story myself and it was awesome. Easily the best game of the series and I can say that it was the best RPG I have played in a long, very long time.
This dude is easily the best endgame boss, more of a challenge than Eredin himself.
Still have the expansions left though, CDPR has done an awesome job at this.
It was a great adventure from the beginning to the end, even though the game is heavily Yennefer-centric it didn't disappoint and I really enjoyed her character.
I already got spoiled so I knew most of the important plot points, got the Ciri as a witcher ending. The game still threw me a curveball at the end though, I thought I fucked it up. Props to CDPR for that.