Dangerous – Hard to Understand the Interface, and easy to make mistakes

This plugin is dangerous. I had a large number of articles with two categories. I wanted to change an individual category on a selection of them. However it instead wiped all categories and replaced it with just the one I had selected.

This is probably how the plugin is intended to work, but the instructions are not clear at all, and there are many spelling problems in the English version, so you end up guessing your way around the plugin, and then wiping all the categories you had assigned.