My hearing may not be perfect, but its far from being bad, and I really can't tell the difference between XM and CD at 70mph in a car with road noise. I think that would be a moot point unless you're a serious audiophile.
My situation kinda "stuck" me with XM, as I have a Pioneer aftermarket stereo in my car and they have XM tuners that interface right into the stereo so you have no extra controls to screw around with.
Overall I enjoy XM. I think I've only clicked back over to AM a couple of times to follow up on some local news, weather and traffic. I don't know how long it's been since my radio's seen the FM band, though. I haven't found the perfect station for me, yet, though, and I doubt I ever will. Shameless site plug here, but I stream the "Beat Blender" station on
www.somafm.com just because I find the music relaxing yet it keeps a nice beat and makes for relaxing background music while on the computer.
My honest opinion about the XM PRC, waste of money unless you're still stuck with a slow Internet connection. There are so many online streaming radio stations that if you can't find the "perfect" station then you just aren't looking hard enough.
And in response to your last post, brandon11983, XM does not censor any content on their channels (though you can have the "XL" channels blocked by calling customer service), but unless the channel has the "XL" designation, you'll hear the radio edits of songs with explicit lyrics.