Went to HHN on Wednesday and had an AMAZING time. It's quite a different experience from Haunt. IMO it's certainly more adult oriented, a bit more "reality" based and absolutely scarier. Which are ALL good things.
I'd easily put the age for Haunt at 13 and 16 for HHN (depending on the child of course).
It's great to have two big "Halloween" events in SoCal that are VERY different. We will for sure be going back next year.
Here is the video:
* Warning: This video does contain images that may be disturbing to some. YOU HAVE BEEN WARNED!!!
[ame="http://www.youtube.com/watch?v=A1bXYG3enpw"]YouTube - Halloween Horror Nights 2009[/ame]