Its one of those tools which when we are developing things we overlook and go for the more developer intense experience provided by Visual Studio.
Actually, Report Builder 3.0 is a good product, with most of the functionality available that the report creator will ever need.
I provided a report model which is useful to the client in terms of restricting the number of objects available and can be used to provide the required metadata layer that contains friendly field names as configured in the report model.
Report Builder 3.0 can of course be used with Analysis Services directly, as this automatically provides the metadata layer required.
Overall, it was a positive training session and from my point of view highlighted again a nice product which is probably underused, certainly by the majority of our clients.