One of the things you can do with a Multi Select Option Set is use it in an Advanced Find. You can filter based on one or more of the values in the list. You can also add a Multi Select Option Set field to both system and personal views, as well as use it as a filter column. These fields can also be mapped between entities all long as both fields are the same type (Multi Select Option Set).
Multi Select Option Sets are also limited when it comes to Workflows. These fields cannot be selected in a condition nor modified in an update record step. The field won’t even appear on the update record form. However, the field can still be selected as a trigger for the workflow.
Multi Select Options Sets also have limitations when it comes to imports. You can import values to the field only if it is an update on existing records. So, if the field is added to the Opportunity form/view, the view can be exported, and values added to the column and then imported back in. However, values cannot be added to the field for new records being imported.
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