I read a lot of romance, sci-fi, fantasy - which are often parts of some series or another and so are all identified as such in calibre. So yeah - LOTS of collections if I let Sony create collections from series, since I often only have one or two in a series.
I effectively have 2 tag columns - the default one that I use more loosely for organization and themes w/in calibre, and then I created a "Sony" tags column that I use much more strictly - genres & subgenres only. ("fantasy" "fantasy:urban" "romance" "romance:historical" "romance:contemporary", etc). The "Sony" tags column is the only that creates collections on my device; it's much easier to browse that way.
