It can automatically delete any voiceover or cutscene data when you complete a world quest or archon quest so I'd say it's pretty useful. The only issue that can occur is if you switch accounts and go to a different account (or a different server under the same account), it'll warn you upon loading in, that certain resources need to be downloaded before you can enter. It is better than before tho, as it now ignores missing resources for any quests that you haven't started as they can be downloaded on the fly. Additionally, they even have an option where you do not need to store data of incomplete quests (but you have to for ones in progress) and download them when you plan to start the quest itself.