The biggest case for me is no rescanning over things I've already seen. Also, filtering things I know I'll never want to read (anything from certain domains and

The biggest case for me is no rescanning over things I've already seen. Also, filtering things I know I'll never want to read (anything from certain domains and some keywords) removes a ton of cruft, even when subscribed to otherwise high-volume feeds. Edit: Another big win, not needing yet another account to be tracked and targeted through just to get at a feed. Best example being YouTube.