Definitely worth reading, especially if you enjoy sort of real-life feel, science-y scifi. It's by Andy Weir. When I heard that Seb Stan had a role, I went out and bought it (it also happened to be on sale for Kindle that particular day, so double win). I think it took me about 4 days to read it (in the past when I read more voraciously, it would have taken maybe 2)... really gripping, suspenseful and really, really funny at times. There's even LOTR references. :D