I have an older iPod Touch running iOS 4.5 and use the Manager to listen to music through my bedside radio going to sleep as well as listening to Spanish dialog courses in the car when I'm alone.
Some time ago Apple on an iOS update removed the ability to access the Manager and after I emailed Tim Cook replaced it within 2-4 weeks. Without the Manager, I'd never be able to use this device. I now depend on it and CopyTrans so much. Thanks.