To me it wouldn't be very useful in situations where I was using the iRiver. When I use my iRiver I want to be as minimal as possible so it would add another two boxes to the list of things to bring, the ADC and the Battery for it, not to mention the adapter or cable to go 1/8 mini to RCAs. This would be very good though as a cheap solution to transfer old MDs or cassettes if you didn't want to buy something bigger and more elaborate.