For those considering this project, I would recommend it. It provides a more streamlined approached to configuring Excel spreadsheets, word docs and PDF from Xpages.
It overcomes some of the complexities and nuances of Apache POI and enables you to concentrate on other things. Our implementation calls on an existing Excel template with the data being populated by a managed bean. This enables all of the formatting to be completed in the template in native Excel, with data coming from Notes docs in the back end.
Overall, a great project that would be of significant benefit to anyone going down the Apache POI path. Either as a final solution or even if it was an interim first step before writing you customised Apache POI code.
Thanks Christian and team.