I have been coming here for years and each time I have enjoyed myself to the fullest!
If you plan on going on a Friday or Saturday I would recommend buying the fast-pass (you also get another house access too!) but other nights are casual and less hectic with crowds.
Prices are really decent compared to what you have to pay at other haunted houses. Most places you have to pay again to repeat the fun, but at fright dome you can go through all the houses and rides multiple times!! Really that's a bargain for a theme park AND haunted attraction!!
Like I mentioned, plan your days accordingly to get the best of your experience!!!
2016 edit:
Great season choices!! I enjoyed Krampus and Ouija the best. Lines are smooth if you purchase fast pass tickets. I'm considering VIP passes next year cause this place was packed