My comparison may be unfair since I was using a separate Clarion sat receiver in my old car with the Sirius external antenna, but with Sirius, my sound quality was almost CD quality and when it did skip out (which was almost never) there was no static... Which there shouldn't be because the sound is digital. With XM in the Z, the sound is basically radio quality and goes out when a bird flies over. Also, when the music cuts out it is all staticy (which it shouldn't be).
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