Ok, so I went out and bought a Sirius radio a couple weeks ago. While the selection of channels was excellent, the reception was quite poor. I setup the radio in my car, and the FM transmitter was extremely weak. Excellent radio (aside from the weak transmitter), but service was poor, so I returned the radio.
Just bought an XM Radio, and the reception is excellent. Channels are pretty good as well. I prefer Sirius programming over XM, and the Sirius radio was MUCH better. However, if I can't receive a strong signal, no point in keeping Sirius.
After having tried out both services, I have to say that Satellite Radio is way over rated. Fidelity sucks on both services. I have always been into electronics, radio's especially so I know how it works. Unfortunately both providers are cramming way too many stations into one downstream, which means they have to compress each station. The more stations they offer, the more compression is needed. This results in lower fidelity and tuneled sound.
I was expecting CD quality sound, however that is not the case. The audio downstream is good, but it can definately be better. There are a lot of stations which play the same songs. Why not elliminate some of these stations?
In any case, I'm with XM for now. Hopefully they will find some way out to increase the audio quality some day...