Anybody listen to channel 16 on XM? This one XM add comes on and the lady talking has a damn annoying voice. It drives me insane

Anyway, XM is worth the $3 extra a month. I haven't bought a CD since I got XM well over a year ago nor have I listened to regular radio in my car. I have noticed an increase in XM add's, but it is still worth the cash.

Are there any big differences between XM and Sirius?