SyncIQ & when-source-modified

Does anyone have any advice on using the schedule "when-source-modified" for SyncIQ. On one hand it seems that this schedule setting would serve to replicate data as soon as it is changed, (Assuming that most of the writes are not overwrites) The total amount of change data replicated would be similar to using a set schedule. In this manner it would act similar to recoverpoint as a continuous asynchronous replication. Does this setting have any sort of underlying implications that I am missing?

Does anyone have any real world experience with this setting? I can’t seem to locate anything specifically mentioned about this and when it should/shouldn’t’ be used. I would imagine that this setting would be a no brainer for archive storage, but my question is more focused around its use as general array replication setting.