I think I tried this a month or so ago. It looked great, except for the one fatal flaw that stopped me from actually deploying it: It doesn't support multiple sites per installation, and I don't want to have to deploy one server per site.
Disclaimer - it's neither self hosted nor free (nor very expensive), and I was previously a part of the team that built it. I can honestly say no data is being sold to 3rd parties, as should be expected from a paid service.