No I have not tested because our Sync is very messed up and we are trying to fix it. I am asking someone to confirm or deny this is the case. Right now our Sync is mostly one directional (SFDC to Marketo) and a Custom Sync on Contacts where there is currently a sfdc validation rule in place to prevent Marketo from updating First Name and Last Name. This is causing many Contacts not to sync where First and Last Name are not identical. We have a plan to fix but my SFDC team is under the impression that Marketo overwrites identical data on every sync. It just doesn't seem likely to me.
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