I'm in the "sounds like crap" camp. It also sounds like they're shifting at about 5k rpms too. Those of us with an E9x in our garage that think this sounds like ass, it's because we hear the S65 every day (most of us), and every day I think good gawd this thing sounds amazing. So yes, the E9x owners think it sounds like crap... because it does. Hey, I just farted and it sounded better than that exhaust note.
Of course, this is still pre-production so sound can change.