With the functionality of default locations we are now starting to see Insite appliances getting overloaded and neighbouring appliances sitting empty, this is because the first appliance is configured in the default location list.
Where you have appliances sitting in the same location the ability to group them together and assign monitors to the group rather than the specific appliance will allow the monitoring load to be balanced across the available appliances as well as aid with faults/replacement tasks.
Criteria's could be set that the appliances must be on the same IP subnet, same version etc as well as the system only performing re-balancing actions one/twice a day to reduce load on the backend systems with monitors moving within the group.