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I've used them for a number of purposes. My main usage is for when I want to keep track of things at author level. Such as at the moment for my parents, where I have separate user categories containing lists of authors that they like. So I can very easily filter and search books that are of interest to them, without having to tag things at book level. Or it can be my own lists of favourite authors, authors I have "processed" to find missing books etc.
With the changes chaley made recently of allowing you to do a search across a whole user category (and then tying this into a saved search) you can very easily bring up a set of books for a set of authors and use that for quick access or as a search restriction. So if you have multiple ebook readers and want separate lists of authors for each this is very easily managed.
I've also used them for other types of lists such as series that I want to read. I find it a nice way to avoid the ongoing maintenance of applying tags/custom column values to individual books as I add them to the library.
Of course the other advantage is that having put them into a user category you have a nice easy to click on lists in the tag viewer for each of them. For my parents particularly that is way more friendly to use than the search bar.
I'm a fan obviously - hence why I wrote the User Category plugin to make adding/removing to lists easier from the library view itself.
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