I don’t know, what you really mean.. But I think, the Rock Solid is a very good Addon. Okay, there are no much difference to the standard-Sets, but the MIDI-Section is very good and I have many MIDI to chose from, and always find what I need..
The only Thing, I don’t know: Why has EZDrummer no Editor? Where you can create your own MIDIs and save them easy in the MIDI Browser.. Or maybe I didn’t found it yet (Maybe I can save them simply via drag&Drop from my DAW.. I didn’t try it .. Maybe I do next time 
)
