My lyrics were in English, German and Finnish. Especially the latter language has made me worry in advance, because I was not sure whether the pen would deal with it. Interestingly, it has been shown that he has just worked on the most accurate in Finnish.
Sure, the pen makes mistakes, but depending on the font and size, he makes almost always the same mistakes. He has, for example from Finnish "niin" almost always "now" and made in a text was from the ending "-ksi" always "--Bi". However, since the errors usually occur after a certain pattern can be prepared well and pay attention to words give particularly affected.
The small corrections that were needed by the error while scanning, are personally in proportion to the time that I would need to write off all sentences by hand for me. But if you only occasionally scans smaller passages, these corrections but can certainly be annoying.
Incidentally, one should also after the first failed attempts not already give up, because it takes a while until you get used to the pen and can thus lead him over the paper that meaningful combination of characters appear on the screen.
Personally, I would highly recommend the C-Pen to anyone who has to work with similar amounts of text as I do.