Totally worth it!
We went on a Friday night about 10 pm. Line for tickets was 10 minutes, line to get into the houses was about 30. I thought looking at the front of the four houses they would be quick walkthroughs, but there were a lot of twists, turns, and dead ends that made it a good 10-15 minutes each.
Lots of "Jump out and scream in your face" actors, but plenty of other scares, too. The last house was by far the best. I'll absolutely have nightmares for a while.
My favorite part was the attention to details in all the houses. There was one acres who must have been a contortionist and she was perfect!
My only suggestion is that screaming isn't the only way to frighten people. Sometimes a creepy muttering or a whisper is far more effective.