Yup, I love Unison. Been using it for years at home. Though I've been worried that it's not being actively maintained. But I guess as long as it works...

I think their position is they no longer have someone paid to work on it, as the research phase has ended. But it is still maintained. Albeit, slowly. And them using a rather outdated website and svn to host doesn't really do them favors. They need to get someone in there to modernize it a bit. Switch it to git. Doesn't even have to be hosted on github, but somewhere more visible would help.