The only reason: the radio reception is very moderate. If the device had at least one switch to mono reception, I was already satisfied (I'm not a HiFi freak). The transmitter catch noise every few kilometers, so that you are constantly fiddling with the radio.
Except for the reception, the device is otherwise super. USB works immediately, the unit will play with the little further, with which one has stopped, everything was wonderful. But no sufficiently good radio reception is all like a Ferrari without an engine. Too bad.