What are the advantages of using GMF over just EMF and GEF?
This depends on what you are trying to accomplish. For full-featured graphical editors that require the rich capabilities of GEF working with an EMF domain model, GMF is a good option. But then, you may be interested in a lightweight implementation, read-only visualizations, etc. In fact, you may not even need GEF, as is the case with TPTP’s visualization of profiling data. For an overview of the features and functionality you can achieve using GMF, look here. To get a sense of how the generative framework can get you going quicker, look here.
