Geof:
I have to say, I've been pretty surprised just how much I've enjoyed XM in just the couple of days I've had it. I haven't even really started digging deep in the channels yet either. One of the ones that's likely to come in handy is the 24/7 Atlanta traffic channel.

The dash integration is pretty cool. I discovered that one while playing with the steering wheel controls. You can adjust volume, mute, and scroll through your station presets all from the buttons on the wheel. About the only thing is that you have to look at the actual radio unit to see artist/title info.