How accurate is 8 mile?

eminem is comin to lolla in chi town where i live this year so im really gettin into his music again especially with tht new album just out..but how accurate is 8 mile i kno the movies old but xplain to me..cuz i kno proof has a role in the battle where eminem chokes did he actually battle his best friend proof and david "the future" porter..one of d12s members is like deshaun porter or sumthin but was he actually the rap battle mc. could some one xplain scenes and characters and how accurate they are please?