hopefully in the next version of revit....when
civil 3d pipe networks can be loaded into revit as editable elements / parts it would be great if you could swap parts... eg. swap a basic manhole chamber created in civil 3d for a more detailed chamber created in a revit family. Alternatively maybe a command could be added to civil 3d to allow parts to be swapped for revit family's. obviously all parts / element data should be transferable too between software platforms.