i used the free trial to sort out a few tracks and it did a great job. there was a lot of spinning wheel going on until i realised this was teh cursor and the app responded perfectly to it when i treated it as such. some slight graphical glitches when a long list of updates were saved and scrolled up the window. it did have the feel of a windows app about it, hard to say why, i think its because the downloaded file wouldnt delete even when the app wasnt running, had to reboot to get rid of it, then deleting the app itself meant itunes was looking for it when launched. the uninstall instructions are in the developers forum and while rather manual, seemed to work fine. the changes it wrought on the tracks appear to be permanent and not removed when i deleted the app.