Bullets should vibrate, so the engineers made sure the UCE did.
Harley's should vibrate, so the Buell Blast (the Harley entry model) did.
Hondas, well, sewing machine. My Civic is still pretty smooth with 190k on the clock and a used Nighthawk 750 i test rode 10 years ago ran so smooth I could barely tell it was running.
I'm sure that 250 is SUPER smooth and I thought about buying that bike. That and the Ninja 250 are both nice little bikes with awesome motors and great mileage, but not too much soul.
Scott