XM is the reason I ended up with the EX-L. The app was mentioned to me too, but I didn't really want to use that much data or tie up my phone just to listen to the radio. I spend far too much time in my car, with questionable local radio service, to not use XM.
Now all that being said, Honda's satellite radio is not even remotely close to as good as the radio was in my Ford. It cuts out much more frequently than it did in the Ford. I'm still glad I have it, but that was a bit of a disappointment. I'm sure, though, that reception will improve once winter rolls around and the trees drop their leaves. And that's when I'm in my car the most.