Hi Ian
Had a good listen, and yes there is a difference in that the S900 is more CD like, (Studio Production) however the Wersi makes the styles sound like you are listening to a live band.
Most guitar voices on the Wersi can have the fret noise changed in voice edit.
Here are 2 more styles (No normalisation required this time) that a friend has done for me, you should recognise them.
BTW the Wersi does NOT convert Yamaha styles, but plays them direct, just like Yamaha keyboards do.
Look forward to your comments

Bill

http://www.4shared.com/file/36115213/fed10e1e/nplugged1.html
http://www.4shared.com/file/36115354/51b348e/Unplugged_2.html