Reviewers mostly see Inbox Zero as a simple, effective way to clear long-neglected inboxes, especially by finding and unsubscribing from old mailing lists. Users repeatedly praise the clean UX, straightforward setup, and time savings, with several saying it helped them clean years of email in just a few clicks. One reviewer also liked being able to read all messages from one sender in one place. The main cautions are limited but specific: subscription tracking can surface lists already unsubscribed elsewhere, and support for non-English email, like Hebrew, is still uncertain.