I work at a software development company. We only have about a hundred employees, so we are not big enough to use Documentum ourselves. Instead, we are developing a solution based on it. We are developing the new version of a court case management system, which is a national scale project.
You need a BPM solution if you are working with court cases files. It's essential to develop the method description for the document data. It is also necessary to implement business process management, and Documentum is pretty good for that.
And for development, we have a team of nearly 10 people. For support, we have one or two.