I've been a big fan of satellite radio and have owned three different XM satellite radio receivers. When the Roady XT model first came out it seemed like a great choice. But, I've found that I miss some of the features found on the other models.
The XM Roady XT is small and convenient for car use. But, I miss the rewind feature and the station knob found on other models. On other models you have the chance to rewind and listen to other songs that were just played. And, without a station knob, you need to push in the number of the station you want, which is more of a hassle when driving.
All and all, it's not a bad receiver, but it's just not as good as previous models. As for the service, XM is awesome. I have a receiver in my living room, which I'll be listening to when I go to start the car. Before turning on my Roady XT, my car is picking up the receiver in my home.
If you're interested in XM satellite radio, give it a try. But, look closely before purchasing the Roady XT model. You may prefer the features of other models instead.