This is my first v twin, and I'd say mine is pretty smooth.
A friend of mine and I were shopping for bikes this past weekend, and the owner of a used lot started a VN1600, and it was smooth too.
Then he tried to show off a Harley 1200. Thing vibrated so bad it would have made a novelty toy at an adult store blush.
When I'm idling at a light, my mirrors aren't shaking, how about yours?
my mirrors and windshield shake when stopped at a light. Nothing major but not smooth either. At higher RPMs, when cruising the interstate, my keys vibrate and I can feel it on the hand grips. Seems to get worse at higher RPM's. I might get the carb sync checked.