I am signed up as host with warm showers, but have never been a guest with either at this point. I have been the guest of folks we met along the way on the TransAmerica and felt this might be a way of offering similar hospitality to that which I have received.
I figure that if I get a bad vibe when they call I can either tell them no or let them camp in the yard. If I get a good vibe I can invite then in and feed them. This is all theoretical at this point since I have not yet actually had any one call. I am not in a location where I expect many will call.