Anyone using Maestro for workflow applications?

I am involved in a small team in the early stages of prototyping a specific intranet web-based application using Drupal for automating, and providing electronic data capture for, certain business processes, using Maestro, WebForms, Entity Forms, web page workspaces and other supporting modules. I might therefore be able to share some experiences overtime if appropriate and this would be from my first hand experience and not the represent the view of the organisation overall that I work in.

The open source and community nature of Drupal provides opportunities to build custom web applications through extensions by adding Drupal modules (such as those mentioned above), though we also want to use Drupal as the "glue" for interfacing and integration with other internal and external systems, both proprietary and non-proprietary. With Drupal Views and Drupal's role-based access to all this information that's glued together, this would enable people to see what they need to see to be able to do their tasks effectively.

We've worked in a number of large organisations and experience tells us that there is no one overall system/application that is a panacea for all business process; rather, if such systems have open interfaces then they can inter-operate - where Drupal comes in here is to provide the glue.

Challenges so far: The above all said, the devil is in the detail and we are in the early stages of prototyping, so much of the above is still to be done. This is a steep learning curve and we are discovering that the Drupal development pool is very public access web page oriented, which is why your post is encouraging as we'd like to be involved in a (sub)community of Drupal that shares ideas on applying Drupal as intranet-based business process application as it has great potential here as well as being the basis of some successful high-profile public websites.