I enjoyed XM. Definitely worth the money to me. I enjoy Sirius so much more though. I know that doesn't help you any, but there you go. If you are in your car for more than a few minutes a day it is defnitely worth 9.99 a month.
I have Sirius and absolutely love it. I had it disconnected for a couple days while I was installing the Kenwood tuner and taking out the old Audiovox (which btw is now for sale..). When it was out of my truck I missed it. I almost feel like I can't live without it now. I don't have any experience with XM but I am VERY happy with Sirius.
Ahh, finally took the time to register. Been searching the boards for a few weeks now. So, you can either buy the Plug and Play tuners which are like $100 or so, or buy an FM modulator and a tuner? If this is correct, what are the advantages of buying the modulator and tuner, because it ends up costing about $200 more then Plug and Play?