Another GM9-AUX opinion
Bottom line...there are other ways to get auxiliary sound (such as an aftermarket head unit as VIP1 mentioned) but you will find that the adapter is a plug-and-play installation in your car.
http://www.fadingarrow.com/XMSatelliteRadio.htm
To connect your MP3 player, you will need a RCA-to-1/8 (heaphone) adapter cable.






