I've been using this app too and it is working very nicely! Thanks for the great work.
One thing I've noticed is that some characters aren't getting used correctly in the file naming ... ie a ',' (comma) ends up as a '%2C' in the file name.
The other thing I've noticed (and not neccesarily a problem with the app ... more with pandora I guess) is that the artist names are not always standardized ... eg 'The Mono Men', 'Mono Men', and 'Mono Men, The' have all shown up! It would be great if the was a way to standardize the names although I understand that is not an easy thing to do!