Cool, hadn't seen this tool. We're using wercker and generally loving it but there's occasionally a problem with the github webhook integration. That said, you can't really beat wercker's price (free in beta for the last few years).
In theory, the prevalence of docker will be good for consumers because we'll be able to swap between this type of service really easily -- just like moving a git repo from Github to Bitbucket.
In theory, the prevalence of docker will be good for consumers because we'll be able to swap between this type of service really easily -- just like moving a git repo from Github to Bitbucket.