I just got XM installed last week and it does rock! It is a tad on the expensive side ($240 for an Alpine TUA-T020XM tuner, $60 for a Terk antenna, $9.99 activation, and $9.99/mo), but I feel it is well worth it, especially if you dislike hauling 374785784 CDs around everywhere. I honestly really cannot tell the difference between XM and CD quality...If anything, the quality compares to a burnt CD-R.