I could not finish it - but at this current moment. I do intend to purchase the book physically, because what I had read - being nearly 50 or so pages - was fantastic and descriptive, with a lot of real science and engineering speak, which is different to the standard speculative fiction that I do enjoy to read. Andy Weir's The Martian is more realistic fiction than speculative fiction. 
 I must say, I did request this for review because I loved Alfonso Cuaron's GRAVITY film A LOT! And that film and this book had a few things in common, mostly that the two are thrillers set in space and the characters alone and striving to survive in the alien environment. But The Martian is just not the read I need at the moment, and I really do hope, whenever I return to it later on down the track, that I do continue to find the book magnificent - but, heck, I've only read 50 pages, so there's not much I can put my hope on just yet. Though the countless positive reviews I see tell me that I should hold onto that hope. 
 This is "science" fiction.