I have it. Just got it about month and a half ago. I love it. The only problem I have with it is that I can't get the damn stand for the tuner to stay mounted to the dash. It's like our dash is designed to prevent things from sticking to it. I've tried all kinds of levels of sticky stuff. Nothing works.
But back to the XM... it's great!!. It's so much better when you just want to listen to music, and the variety is great. There is always something great to listen to. For only $9.99 a month, plus $2.99 for the Playboy channel (which is really a waste, you can't beat it! If you can spare the money to get the tuner and pay for the $10 a month, it's totally worth it.