I chose this audio book to listen to while my daughter and I drove through France with her children (boy aged 6, girl aged 10). We all found it very entertaining and it held our attention on long drives - no mean feat for an age range of 6 to 60+. Perhaps its appeal lay in the story's modern setting, while introducing many of the characters of Greek mythology. That - and the excellent reader, Walter Lewis.
The children are now keen to see the film and read some of the other Percy Jackson stories.