There's a new Patch Demo of the GW-8 up on Roland's site. You can only see the players hands, but based on the hands alone I'm going to say it's Ed Diaz doing the demo. It's not too bad....
http://www.rolandus.com/products/productdetails.aspx?ObjectId=968&ParentId=72
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GEAR: Yamaha MOXF-6, Casio MZX-500, Roland Juno-Di, M-Audio Venom, Roland RS-70, Yamaha PSR S700, M-Audio Axiom Pro-61 (Midi Controller). SOFTWARE: Mixcraft-7, PowerTracks Pro Audio 2013, Beat Thang Virtual, Dimension Le.