I've looked at it twice:

1) New Buggy back when I was commuting an hour a day. Paid for XM (before they merged) for about a year. Liked XM, but never really "learned" the stations and missed traffic/news type stuff. When I stopped commuting AND they merged and screwed up my channels, stopped XM.

2) Next New Buggy: came with 6 months free. Didn't use it during the 6 months, and haven't missed it since. The ONLY time I think it would be nice is long trips in the middle of nowhere where there are no good stations. But.....not worth it for me because those trips aren't that frequent.

ETA: I like classic rock mostly. Never found a happy station for that. You have DC101 - I would LOVE to have that good a station here!