I can't really say much about the Makima twist because it's been such a long time and during that time I was binge reading the chapters, so I don't really remember if I was surprised or not with that twist.
But when it comes to the Fami and Death Devil twist, that twist to me was surprising, and I do believe it was a good twist.
Just to make sure I wasn't the only one shocked by it, I went everywhere to see everyone's reaction, and almost everyone was surprised by the twist and even saying it was really good.
Maybe only a very few weren't surprised because they already had a feeling that "Fami" was Death, and yeah when looking back, the hints were there.
I'm just happy that the character we thought was the Death Devil wasn't the real Death Devil, especially seeing how she was getting beaten so easily last chapter.