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When I first used the plugin, it marked post thumbnails as “not in use”. That could be remedied with setting the right option in the settings (which I didn’t see at first because of a poor wording at the time). Jordy fixed a related minor problem in the code very swiftly.
After that, I had no problems at all with this plugin. It finds the images not in use and puts them in a separate trash folder if I “delete” them. I then wait some time to see if any of the image links are broken (which they weren’t) before emptying the trash. In the case mentioned above (wrongly marked post thumbnail), a simple click was all that was needed to restore the image to its original location.