When linking in an revit arch file (struct too, not talking about DWGs nor DNGs), I have always used Origin-Origin for the insertiion point. Once the project is setup, I adopt any Shared Coordinates within the arch file via the Coordinates function on the Manage tab. I have never used Shared Coordinate and to-date I have not seen any adverse affects. (I have exported to Navisworks via Shared Coordinate.) So the question is, is this the experience of everyone else out there? What occassions, if any, casused you to have to use Shared Coordinates for the insertion?