I agree with Wolf, that all you guys have hit the main perspectives on making a yes or no decision. Here's my story.
For my commute, I like music. I see Hyson's point about utilizing available time for podcasts etc, but I'm not a regular listener of talk, except for Stern. There are 2 FM stations - one college, and one independent adult contemporary - that play a good mix of new and old music I like listening to. The college station is commercial-free, they do about 5 minutes of promos and news per hour. However, they're in Boston, so I can only get them for half my commute. The other station has the usual commercial break every 20 minutes. To that mix, I add the SXM app on my phone. Sometimes I go right to the app, but usually I start with FM, and switch to the app when a commercial hits, and the college station is out of range. In any case, I get some time with Sirius XMU every day, which gives me more new music.
The wife's truck has satellite built-in, and that's all she/we listen to. When we drive together, it's mostly Spectrum, Classic Vinyl/Rewind. At home, I use my old cell phones for streaming SXM through my home theater system, and on my 3-season room (back porch) stereo. I use it as background music for dinner, working around the house, or when we have people over. The channels I mostly play are 1st Wave and The Bridge.
Like Hyson, my time is also valuable. That's why I don't waste it downloading and compiling music. And although I listen to my own music collection at times, I don't want to keep hearing any set collection of music over and over. I have a love/hate relationship with SXM. I like having a DJ or program manager pick music for me; I get a better variety, and hear new stuff.
But I'm often frustrated at the rigid formula, excessive repetition, and forced DJ "storytelling" and constant promos for programming. I yell at the radio for Richard Blade to STFU. I avoid Alt Nation at night, because the moment I hear Madison's long-overplayed shtick, I have to change it. I cringe when Kristine Stone constantly laughs at her own inane thoughts. The between-song station IDs are maddening: the annoying-as-shit Classic Rewind cassette tape sound, the too-cool-for-school Alt Nation thoughts, the "coming to you from the Alan Freed studio at the RRHOF" bullshit. Also, they preempt regular programming every weekend for special stuff I don't want to hear; hours of live festival broadcasts, and various music talking heads blathering on about obscure shit.
So I'm not crazy about the service, or the way it's managed, or the cost. But I don't see a better alternative for me, because I use it so much.