We've been on the list for two or three years now. In that time we've only hosted twice, but they've both been rewarding experiences. As you can imagine, like-minded people find a lot to talk about.
We've never used it as guests, becuase there have never been any hosts along routes we wanted to travel. We did, though, enjoy several days of tdr1nka's hospitality at the Shedravan in Ireland last year, which is sort of similar-ish.
It is a good idea, and that's why we support it. I would recommend it - there need to be more people listed in Britain.
Last night's guests were cycle touring for the first time, and had been wild camping for two nights previously. They were quite glad of the shower and a chance to dry off their kit.