> I'm checking out XM right now and wow, I'm liking a lot of
> it, I'm thinking about getting it, not sure yet though if I
> realy want to shell out a lot of cash on radio, but I'm
> realy thinking about it, for the most part, because they got
> BPM

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I have both XM and Sirius being the radio geek that I am. Besides, I got tired of listening to a bunch of stations that have fired me!
I enjoy both services, and I don't regret the purchases. However, neither is for everyone, and both have both major benefits and deficits. I generally like the mainstream formats and got sick of having one choice of everything but country, and both provide excellent choices though neither service's mainstream formats are programmed significantly better than most large or major market local stations. Given that I live in a small market, the large to major market sound is nice. The lack of commercials is also a definite plus given how much stations tend to load up on spots. However, I'm not sure I'd pay for radio solely to get out of hearing spots or to get a major market sound. As Jimmy Cinnamon Roll mentioned, the satellite companies definitely have a wide variety of formats, and that's a good thing, especially for those such as yourself who like more non-traditional radio formats, but satellite radio also falls victim to narrowcasting worse than any commercial radio station you've heard. As an example, if you like 60's and 70's oldies, you can rest assured that you're favorite oldies won't go Jack FM, but you have to flip between Channels 6 and 7 to get all of your favorites on XM. Sirius remedies that problem a little bit by having a 60's/70's oldies channel on 6, but it still seems to narrowcast more than the remaining terrestrial oldies stations. I find myself listening to both XM and Sirius more than terrestrial radio, but I also find myself flipping between satellite channels and commercial radio quite-a-bit.
If price is your only concern, the price is really pretty reasonable. You can get two XM radios for about $100 or one Sirius radio for about $50 if you act during their current specials. Activating two radios of either service only adds up to roughly 73 cents a day. Just bring your own soda to work as opposed to buying one when you get lunch, and you've made your 73 cents. The radios are quite nifty and have more bells and whistles than your traditional radios.
Whether or not satellite radio is a worthwhile expense just depends on what you want. I'm not sure I would have bothered if I still lived in a major market, though I'd keep my satellite services if I moved to one now.