Worked well at first...

Ive used the app multiple times without issue. My last set of ringtones I made, failed to copy correctly into iTunes after I followed the exact steps for integration. I believe this was caused to the app failing to generate the proper file extensions so the ringtones would upload into iTunes as true .m4r files.
Also, bringing up my library is also sluggish after I have multiple ringtones saved without clearing the cache of saved ringtones.

SpleenLessDave about Ringtone Maker – create ringtones with your music, v1.1