The best thing about unlistr is that it has all of my emails in one place, so I don't have to go through them separately or remember where each person sent me something! It also makes filing out those 1023s super easy because there's only 1 document for everything instead of several spreadsheets with different names/addresses etc. Nothing really - but if you're looking into getting rid of your spammy lists from various sources (like autoresponders), this can be helpful as well since they are often not listed anywhere else online, which means people will end up finding yours when searching for information elsewhere.