I used to like them, but now I find them too big in the paper format. If there were released in the ebook format, great. It does get confusing though when you are trying to follow a series and suddenly another book with a different name shows up that includes 2-3 of the existing one.
In the past I have purchases an omnibus edition without realizing I already had all the books.
Is the plural of omnibus omnibi? Like syllabus/syllabi?
