Real Jazz in the only station on Sirius/XM that plays "straight ahead" jazz. There is Water Colors, which is the smooth jazz station, and Spa, playing "Windham Hill" type of stuff. The other station that I listen to for jazz is 40s on 4, that station play big band music from the thirties and forties, and is very good.
I love having Satellite Radio, as I drive a lot, and I'm able to listen clearly to any station wherever I am (I love to listen to baseball games when I drive). I also have it set up where I can play it through my stereo system at home. I've enjoyed that so much, I canceled my Direct TV subscription.