I purchased a used car in June of last year and this receiver and car kit came with it. I tested it until the original owner's account expired (end of June), so I know that everything works very well.
I'm not a big radio listener, so I have no need for it since I've decided not to continue paying for the XM service. Everything you need to hook it up and listen in your car is included:

• Audiovox Xpress XM Satellite Radio Receiver
• power source (for car cigarette lighter)
• antenna
• audio cable (to plug into your AUX port)
  For reference, Amazon values a kit like this at $130 new, selling for $100:
  http://www.amazon.com/Audiovox-XMCK20AP-Xpress-R-Satellite-Receiver/dp/B000RYS3S0/ref=sr_1_23?s=car&ie=UTF8&qid=1312053191&sr=1-23
  I'm throwing in the Bracketron Universal cup holder mount (valued at $30 new, selling for $15) as well. Good not only for the receiver but any iPod, PDA, or smartphone.
  http://www.amazon.com/Bracketron-UCH-101-BL-Universal-Holder-Mount/dp/B001UGMTKC/ref=sr_1_3?s=electronics&ie=UTF8&qid=1312059570&sr=1-3