Unless you finished the golden age arc in the Berserk manga than you should NOT read this, go and read up until the Conviction arc than read this.
Story(9/10): The story is simple but as the summary implies this is an 1 on 1 conversation between Griffith and "God". You can't say much about what happens because its extremely short (1 chapter) without saying spoilers. Its an interesting conversation though.
Art(10/10): Its no real surprise really Berserk always had amazing high detailed art and its no difference with this.
Characters(7/10): Only two characters are in this Griffith an already established amazing character, and "God" who is never really
mentioned after this. "God" is an interesting character but because its only one chapter worth of this character we don't know much about him.
Enjoyment(9/10): Its a quick read and it really pays off for any Berserk fan who reads this, all this adds is more character development for Griffith and that alone is a good thing.