Just finished the main game and Wow, very long, creepy, lots to do and lots of action, great story, a variety of interesting HOs and puzzles. And from what I've read on the BF forum, the Bonus Chapter is fairly long.
Hard to believe that this GT game is the 11th one in the series and they can still continue to make it interesting and for me the best one in the series and that is saying a lot considering the others were great.
Give the Demo a try whether it be the CE or SE version..