I installed it and took a quick look. It comes with one set of alternative sounds which to me are not worth it. It does have a counterpart for your computer to make more sounds with, but I did not look at this.
My "scare" with it was uninstalling it. Cydia locked up and when I rebooted the phone it took longer than usual to get past the boot screen. Fortunately the phone did come back up and is functional.
i love it so far but it's not free, you have 5 days to donate. It works but I have to come up with a better sound if I wanted to and put it on itunes then to this app.