That's a good idea-- maybe I'll rent a car with it and try it a while. I just don't feel like making a big investment on something that may not be worth it.
The good news is it isn't even much of an investment. I think you can get started for as little as about $125, and subscription is around ten bucks a month. Try it for a weekend in a car rental. If you enjoy lots of variety in music, I think you will like it.
If you have Dish TV you can sample Sirius radio. They just added it to the audio channels. I really do like the variety they offer. I live in an area where the only stations are country, urban, pop, classic rock and stuck in the 80's.
$120 isn't such a big investment, plus $10 per month. I have had XM for about 3 months and love it. The talk channels alone are worth it, along with the 70's hits station (no commercials on music channels). You can move the radio from vehicle to vehicle with little difficulty (I can't wait to take mine on our van drive from NC to St. Louis). You never have to change stations. No stations fade out. It is really a great thing to have. I even listen for 30-60 snippets to Air America, when I want to get my blood pressure up. I recommend it highlyl.