Yes, sirius is commercial free...
(You can get tons of comparison threads at both
www.xmfan.com and
www.siriusbackstage.com ) both a bit biased in obvious directions...
ps: i was looking at siriusbackstage, and they say sirius has closer to 100 repeaters, in major areas...
Zach, do you live in a large city, or what? I drive through some small streets on my college campus surrounded by large, 4-5 story buildings without a problem... i've had a few problems in downtown wilmington (DE), a small city (probably no repeater) w/ a few small high-rise type buildings...