Sadly I have no 5.1 System, yet.
But I listened to it closely, and I have to admit, that it sounds great. Only Parts I am not sure is the "It's Crazy" and the shot.
I would say, that the MAIN of "Its Crazy" is correct, but the 4 other streams are still the changed voice...
(I made a wave file with eac3to out of the ac3 so I could listen to every single stream in the file...)