I've had XM installed in my A4 for about 8 months. I can see how an Ipod is nice to have - especially with the wireless transmitter - I don't like having wires all over the place. But I gotta tell you XM is awsome for long trips. I drive back & forth to Canada several times a year with very few drop outs. The only places I have trouble are when anything really big blocks the south western horizon - like a montain or really large building. XM supposably transmitts terrestrially in addition to the satellites. Anyway, since I don't have time to trool the web for new music, XM works for me. 
