You want vibrations, ride a solid mount 1200 sportster. My 02 and 05 Dynas will remind you what HD is all about. But like others have said the engine smooths out at speed. The engines in the soft tails are counter balanced for a smooth ride. Believe me it's real cool to sit a red light and the paint shaker between your legs is doing it's thing. The dad's in the mini-vans love it.

 

My 06 Lowrider with 16k miles shakes at an idle which is very cool but shes as smooth as glass once i get moving. No foot massage either.

 

My 07 Low Rider has a few vibes at idle but not much and she is extremely smooth once you start moving. If there are excess vibes it might have a bad motor mount. I have read a few posts on the front mount needing shims to fix the problem.