I love this book so much! It's smart and funny, nerdy and suspenseful. It felt real, like we are already doing manned missions to Mars. I liked that the issues that he had were believable, and that his solutions were also believable. I also liked seeing consequences to some of his solutions. 
 It was a little different than the movie, but I think that they complemented each other well. 
 This is definitely a favorite of mine, if you couldn't tell by the way I've already read it four times in 5 months. I'll have to get a physical copy for my library, as I currently only have Audible and Kindle versions.