They do have an Updates page; and they also state that you need to get updates through Amazon or Kobo if you bought books there instead of through their website.
Just be smart and immediately download what you buy.
The biggest annoyance is that some links in their online TOC's are not links. The books are too big to open with Sigil, but Calibre's ebook editor / tweak book can do it.
If you get one or two well illustrated books from each omnibus, they are already worth it at less than $3, IMHO.
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