Three words for you. BEST. MOVIE. EVER!!!!!!!!! My friend sammcpenny and I read the book (check out her review) and yes, it was different but man it was awesome. All of it was so cool, the costumes, the sound track, the plot and best of all there was not a single flaw! now if your really nerdy like my friend you'd probably tried to look for flaws but there are none! my favorite scenes were when Mark Watney grew taters on mars and when he called himself a "space pirate". Who would not like a film about a botanist stuck on mars am I right? on a scale of one to ten I'd give it a thousand so totally check it out!