I had XM for two years. At first, it was great, but as time progressed, the stations got worse and they started getting rid of programming that attracted me to XM in the first place. The recent price hike along with adding crap such as Opie and Anthony was the final straw. I canceled about two months ago.
Depending on the receiver, you can take it just about anywhere with the right "kit". I know the Delphi unit has car, home, and boombox kits. One of the fansites had a "walkman" type setup (using the original Delphi unit) long before the new Delphi "walkman" device. I never used mine anywhere but the car though...
Chris