Never done it personally but its been on my list for ages. One of those cases that genuinely holds up under scrutiny - the crime itself is fascinating from a historical angle before you even get into the paranormal side of it.
From what I've read, the overnight experiences people report there are pretty varied. Some get absolutely nothing, others come out with decent EVP captures and the usual equipment responses. I'm always a bit cautious about paid haunted attraction type places because theres a commercial incentive to play things up, but Villisca seems to have a decent enough reputation among serious researchers.
Anyone actually stayed there? Curious whether the activity is consistent or more of a random thing. Also wondering how they handle multiple groups - do you get the place to yourselves or are there other people in at the same time, because that would massively affect the investigation conditions.