The manga series has well over 32 volumes and a 26 Episode anime adaption. They also made live action movies about the manga. So it's safe to say the whole concept is interesting and deserves to be read.
Personally I like it because it's a mature manga with none of the shounen elements in it except the epic ones. It displays human nature and the will to survive whatever it takes. While reading it you might find yourself getting shivers because the amount of epicness is overwhelming.