Although I just got this as a gift, my wife has had Sirius since Christmas (a gift from ME).
I got her the car kit, home kit, and portable kit. The problem for us is reception though. You are given an antenna with about a 25ft cable, but you have to (in my area) have a pretty good view to the west to get it to work.
At home, I have to string the cable across the room to a window. At her work, there is no chance at all of getting good reception.
The good thing, though, is that we are Dish Netwrok subscribers, and it Sirius channels come in thru our satellite.