I came across this tour by chance on Groupon and decided to give it a try during our last visit to Seattle. We were actually going to do the Underworld Tour (evening underground tour) but decided to do this instead and I'm very glad we did.
Jerome was the guide for our small group (8 people) and he was fantastic! He was such a good storyteller and very good at interacting with the group. The tour isn't really that spooky (except for one part) but offers a lot of great history and a bit of comedy. My boyfriend who has no interest in ghosts or the occult even enjoyed it. It's about an hour and a half with a moderate amount of walking from site to site, nothing strenuous and you stop a lot along the way.
I've done the Underground Tour (daytime) before which was good but this was better.