The PDF splitting function by Top Level Bookmarked name is largely to main reason we have Acrobat Pro, however annoyingly the splitting fails if you have the same Bookmark name more then once (see image for error message), as understandably it can't save two pdf's with the same file name.

It would be a handy feature if Acrobat Pro could instead of aborting the split request halfway through, it instead adds a consecutive number at the end of the duplicated file name (for example 'Jo Blogs.pdf' / 'Jo Blogs_1.pdf').