If you have Sales Insight, many (if not most) of the activities synced over will be redundant with what the rep can see in MSI. We have MSI, and we only sync over a few activites:
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Filled out form
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Clicked link in email
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Sales email sent
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Clicked link in sales email
Even some of those don't really matter that much to us since we have all of that activity stored in MSI.