Works fine if you know what you’re doing…

Is this plugin good for noobs? No. But assuming you know what you’re doing, make backups of your database and site, and follow the instructions… then yes, even the free version does exactly what it says. The issues occur due to other plugins. For example: this plugin has no way of easily recognizing if an image is enclosed in a tag created by another plugin. It would be impossible for the author to support every image plugin out there. As a dev, I can understand this limitation. But it helped me clean up a lot of old images which weren’t being used due to posts I had removed years ago. Not for noobs, but a handy tool for the rest of us.