I like that it's an easy way to deploy applications across multiple environments, including cloud-based services such as AWS or Azure.
It also allows you to create blueprints of your environment which makes managing deployments much easier in future projects. The UI could be improved - there are some things missing from their documentation (such as how to use templates) but this is not unique to elasticbox so can't really comment too much here! We're using Elastibox primarily at present to help with our continuous integration pipeline by allowing us to easily spin up new dev/test instances without having to manually provision them ourselves each time we need one. This has helped speed up development cycles considerably since previously we would have had to do all of these steps ourselves before deploying into production.