I went on opening Friday the 19th at 10p and there were no lines - there were really no more than a dozen people. There were lots of ropes however which indicates they do expect long, long lines at some point. Got my $22 ticket discounted to $12 via a Living Social deal. It took about 40 minutes to go through the 4 separate themed houses - no lines anywhere though. The first house was my favourite. Actually I would rank them in the order that you go through them.
Mental hospital. Carnival. All the sets were really well done - lot of thought and creativity went into them. The actors and staff were all nice. There were actors throughout all the houses jumping out or doing a "skit" all over the place - around and above you. At one point an actor ran in to me and then popped up later in front of me to apologise. I recommend this place. I think it's better than the other nearby options.