On the Sirius website the Sportster costs 119, vs. the Starmate at 99, so it has to be better!
If ya get the car kit for it, go to EW and get the FM Modulater/Booster for it, makes a HUGE difference in the reception and sound quality.
I got the cheapo one they offered free a year ago and have it velcroed to the side of the rocker panel in my car, and if I want to change channels I just use the remote. I never really look at the display while I am driving, and realy hardly change it from channel 33.
They've done studies you know.... 60% of the time, it works every time