Our project team used RRC on a requirements definition project involving 13000 stakeholders and very tight timeframe to deliver.
We used RRC in our environment internally to capture and organize the client's existing documentation, to capture and organize our interview notes, whiteboard sketches, survey results etc. for re-work and ultimately assembly into a final deliverable document for the client.
RRC dramatically reduced the time taken to do internal assembly, discussion, and finalization of deliverable documents internally. If we had provided the client stakeholders with access, the time would have been reduced even more dramatically.
We integrated with Requisite Pro as we identified requirements to manage them formally and then brought back reports from Requisite Pro into the deliverable documents as we sliced and diced the requirements identified in different ways.
We also used a third party tool from iRise to do application simulation and incorporated its output documents into our reports...we used this instead of RRC storyboards. The versions of each tool that were integrated were not available when we did the project.
Although we did not use all the functionality of the RRC product on this particular engagement, I highly recommend the product for other consulting organizations, particularly if they can involve the client stakeholders in the collaborative process.
Disclosure - my firm is an IBM Partner but we also use the software to carry out projects as a customer and it is in the context the review is being written.