I have had XM since Christmas. I absolutely love it!
I used to listen to News Radio (WCBS 880 New York) all the time. The traffic channel on XM is much more in depth that any one on “free radio”.
XM also has Major League Baseball. This is big to me as I am a big Mets fan and during vacations (away from home) I hated not being able to listen to the games. I also can now listen to Mets games while on the boat! The depth finder and motor emit waves that disrupted the AM signal completely so unless I was stopped and depth finder was off I was unable to listen. I tested everything out on my maiden voyage last weekend and it works great!
I also used to listen to Opie and Anthony when they were on WNEW in New York. They are on XM now and I have found myself drawn back into their tomfoolery. My wife has even become a fan of the show now!
I also find myself listening to a lot more music than I used to. My favorite channels now are the 60’s, 70’s, 80’s, boneyard, big tracts, and top tracts. (The last two are almost the same thing)
The only downside is I listen to much less news nowadays and on my way home from Shea Stadium last night I listened to the post game wrap up and music on XM. I was a tad taken aback once I got home and my wife asked me if I heard about the stuck Roosevelt Island Tram. I did not and she gave me one of these--->

as I am usually right on top of news, and a source of news for my wife.
On the plus side about the news, all the major news outlets are on XM and if I wanted to I could listen to them. I have found myself being a little happier not listening to depressing news all the time.
I will never give up my XM Radio!