I've had Sirius for a year and a half. I love the content, but the equipment is a little sketchy. I've had one docking unit already shit on me and they had discontinued selling it. So, I had to pay a premium price for it on ebay.
I listen to Alt Nation, Backspin, Coffee House and sometimes Left of Center.
In the afternoons, there is a guy named Jay Thomas who does a talk show on "Sirius Stars" (Ch.102). He's pretty good.