The sound quality is a function of the quality of the tuner in the radio; not specifically the service itself. It sounded awful on the factory radio in my Wrangler but when I added an aftermarket radio with one of the new tuners it is now a night and day difference. The typical factory radio probably has a **** tuner in it.
Exactly, the sound quality out of an Onyx Plus hooked up to decent speakers is top notch.