The books were amazing and the show does its best to recreate them. That being said, if you are going in hoping for an exact retelling of the books, you are going to be upset. The show is good and I think I would have liked it more if I had not read the books first.
The main character casting is 10/10. I thought they brought the book characters right off the pages and Thomas Jane as Miller was the best in my opinion. But there are alot of story that is left out and was extremely dissapointing. There are also some major changes to characters and characters not from the books in major roles that felt unnecessary.
Overall, it is still a solid show, I just wish they could have stayed closer to the books and made the show into more seasons. Definitely worth a watch if you like space and Sci-fi.