I got the XM Roady using the wireless FM transmitter. Installed it myself. Easy. Works great. I have heard that the tuner on our radios does not pull in stations real well. That actually helps the FM transmitter because in my old car the radio was too sensitive and I kept getting interferance from those stations close to my frequency. I have not had to change my transmitting freq. since I installed it.
I never listen too regular radio at all. check my album there is a picture of my XM in there.