I'm really impressed with the fidelity of the Delphi tuner---I wasn't expecting much, but its every bit as quiet as any high-end FM tuner I've run across. The frequency response seems to be better than FM, with high notes sounding much more extended, and less "nasal" or artificially emphasized.
Sound Quality? If "FM" was a "1" and CD Play was a "4", XM would rate as a "3." Though, strange enough, fidelity can be different from channel to channel on XM; some sound great others sound a little "bloated" for lack of a better term...

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