It is very easy to use, it can be used for any type of application including web applications or even command line tools like git repositories.
The documentation could have been improved but overall I think this product has great potentials. If you are looking at deploying your app then definitely give capistrano a try as there isn't much downside compared with other solutions available out there today. We were able to deploy our code faster than ever before using their CI/CD solution which was previously complicated & manual process.