I think if you standardise tags on your books in Calibre, rather than leaving them as they come from the publisher, they can make for very useful shelves/collections - all my historical fiction on one shelf, all my Star Wars stories on another. If you don't you'll probably wind up with a lot of random shelves with only one or two books on.
My GloHD already has a function to tell me which books I've read, in the middle of, or haven't read yet, so I don't bother with a column for that.
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