We got the Sirius Sat package and LOVE it. I stopped listening to anything else (Hair Nation, Buzzsaw for me and All Elvis, Sirius 1 for the wife). As for commercials, ya there one every 5-6 songs but it's like 10 sec then back into music. Same with the DJ's they come on, talk for 30 secs then more music. I did notice that with some of the stations they play alot of the same stuff over again, like alot of Def Lepard and Bon Jovi but not nessesarily the same songs. Also there are tons of channels to surf though anyways.
We got the Boston 9 speaker system so I tend to crank it up in the Jeep. :P