I too noticed the vibration. It seems to me the vibes are only noticeable in 1st and 2nd. After that I didn't think about it. I'm not sure at what RPM becuas as others mentioned, I could really read the gauges with my full face helmet on.
The other thing I noticed was the seat hardness. MUCH harder than my solo stack Speedmaster.
Would I buy one? Absolutely! If I had the money and was ready to buy another bike. VERY torquey!
Clay