The 900 will sound the same as any of the triples out there be it an RT or an F3. As for the 600 they will have them soon no doubt and should sound like many of the parallel twin engines through time. They will have to make the adjustments to the mounting so that may take a bit..check youtube they get on there first....
Gene and Ilana De Laney Mt. Helix, California
2012 RS sm5
2012 RS sm5 , 998cc V-Twin 106hp DIY brake and park brake Classic Black