Sounds like shit. The road car may sound "better", but it doesn't sound good. They obviously aren't done yet, so hopefully they do a LOT more exhaust tuning!
Unfortunately I haven't take video, but I've seen the mule running around the Dearborn area many times.
Definitely doesn't sound as good as the V8, but I think that sound could grow on me. I love the way it looks though. I was stunned when I first saw it at the Auto Show.