Your plugin is a blessing: I have an entire 900+ entries Excel spreadsheet to import into two custom post types. You just saved me a month of work.
The values I have to import are in French. Excel's ANSI encoding caused strings to be cut before the first accentuated character for each one. I have opened the csv in NotePad++ and converted the encoding to UTF-8. Worked like a charm!
Maybe someone could benefit from this piece of information :)