well i got loads off of the "ghost box", especially on my digi recorder, they did catch a "shoadow" person going down the steps blocking the laser grid (I am waiting to see it myself, my team mate has it) and there is supposedly a few other things.
I myself didnt feel threatened, but I usually dont. I think there is definitely activity there, but when in the basement we asked how many were there and got "10" although I am not sure as it did not show up on the voice recorder it might of been a channel sweep we heard.
These tenants are the third in a year and a half.