I really enjoyed the books so I'm a bit nervous of watching the series. I get so annoyed if they haven't got the personalities right or change the story in a way that stops the plot making sense. On the plus side, it must be at least a decade since I read the books, so I only have a partial memory of the plot.
In reverse, I have been completely hooked on The Expanse, and am holding off on reading the books until they have finished making the TV series because I'm completely committed to the plot and characters and don't want to find that they are slightly different in the books.