Reviewers see Inbox Zero as a simple, effective way to clean up overloaded inboxes, especially for unsubscribing from old mailing lists and grouping messages from one sender in one place. They repeatedly praise the clear UX, straightforward setup, and time savings, with several saying it helped them finally tackle years of email clutter. Criticism is limited but specific: one user saw already-cancelled subscriptions still appear, and raised uncertainty about how well the AI helper handles non-English email, particularly Hebrew.