Back in 2005, the wife and I were flipping thru the Sirius channels on Dish Network and happened upon First Wave and she got excited that this was the type of music she loved in high school and college. To me it was almost brand new since most of it was never played on radio here in Oklahoma. Plus we really enjoy the other Alternative stations also (Left of Center, Alt Nation, etc)
Since Oklahoma City radio is horrible and we lost the only Indie/Alternative station available around that time (long live The Spy!), we purchased a Sirius receiver for her car. A couple of years later, we bought another for mine, plus I listen all the time at work online and thru Dish at home. I did the free online trial of XM, but we just stuck with Sirius.
I can't ever see returning to terrestrial. It's dead to me.