I just got the Sportster a few days ago. Content is great. But, the FM modulator is really, really poor. In New Orleans, all fm bands have either a station or bleedover, so I'm running it through my ipod fm modulator. I'm looking into a direct connection to from the sportster to the antenna port on the back of of my radio to eliminate the static.
And, yes, NFL Network, on sirius is great. Between that and the NFL network on TV, I think I'm driving my wife crazy.