Bar end Mirror vibration as it relates to rubber inserts

[mbopp]

There seems to be some debate on whether one should get mirrors with rubber in them to prevent vibration, OR if the rubber makes vibration worse. I have heard a lot of people say the rubber vibrates worse (like the stock mirrors) because of the flexibility. But others have told me that the rubber helps vibration.  In fact the rubber is there for the sole purpose of limiting vibration.  So like I said, I think I'm leaning towards the non-rubber kind.  However, I wouldn't mind having a poll of what those on this forum think. 

Thanks