The ability for me as an architect or developer is that I can easily create diagrams in different formats like UML/UFD etc with ease! It's also very easy when it comes time creating my own diagram elements (like rectangles).
Nothing really at this point but if you are looking into generating your first set of docs then definitely give them some consideration because they do have great support via their forums which makes things pretty smooth sailing once implemented properly by yourself team members :) Great tool overall though just not quite perfect yet so take note before purchasing otherwise there will be issues down stream where no one wants those problems :P.