Works very well, and everywhere

This works with the bulk edit function, and it’s implemented on a low enough level that it even works with other plugins’ implementations of bulk edit, like Media Library Assistant’s bulk tagging new media feature. It also works with custom taxonomies. Seems stable and well done, and it definitely makes things easier for extensive taxonomies or taxonomies with slight redundancies or similar sections.

It’s much quicker than scrolling about and it eliminates most categorization mistakes during entry because you’re forced to drill down through the hierarchy, so you can’t mess up and choose the wrong term.

The only feature I would add is perhaps an icon that changes when a section is expanded, rather than the static “up-down triangles” icon. And while I do appreciate the “it just works” nature of this plugin, perhaps it would be nice to have the ability to switch the feature off for individual taxonomies. Other than that, great plugin providing a much needed feature that should be part of WordPress core!