I use Link Documents in a limited capacity.  So far it has been for things like when everyone in a department needs to electronically acknowledge the policy (through Forms).  I will link each of the stored acknowledgements to the original policy.  Or I have a scanned document of a list of audits a department did.  Each audit has a different set of documents for it.  I link each set of documents (scanned in as 1 document) to link back to the list.