A counter anecdote, I've used Tesseract for a largish project and it's worked wonderfully. Typically, on a full page of text, there'd be one or two minor errors

A counter anecdote, I've used Tesseract for a largish project and it's worked wonderfully. Typically, on a full page of text, there'd be one or two minor errors, easily 99% accuracy. Irritatingly for me, but also impressively, it seemed to detect ligatures correctly (it used the unicode 'fl' instead of 'fl').