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The contents page lists the issues in story chronological order, and that's how you expect them to be sequenced in the e-book. But, super confusingly, the sequence bears no relation to the contents page. You get issues from each title grouped together, and the titles are almost displayed in alphabetical order, but not quite: New Mutants, X-Men, X-Factor, X-Terminators.
It makes the entire narrative impossible to read without shuttling back and forth to the contents page, to see which issue comes next. This might be manageable if you could click on a title to jump straight to that issue, but you can't. Even more annoyingly, bookmarks rare for some reason disabled, meaning that you'll waste ages scuttling around with the scrollbar.
Skip this edition! I've been reading iBooks versions of Marvel collections, and they seem a hell of a lot easier in navigation etc....