Mine certainly wouldn't rattle anyone's fillings.
The Vibration increase is VERY mild w/ my Prothane Poly-U "Tranny-Mount" bushings.
(From Tony D at NewEdgePerformance...
)
"...having that little bit of whatever those bushing do..."
Do you know what they do?
For those who don't, they limit the flex of the engine in relation to the car.
The net result is more immediate power getting to the wheels, instead of being lost in the slop of the Factory bushings. (Which do flex ALOT. Try revving your car from the throttle-body and watch the Zetec Flop)
With my Prothane bushings, that slop is GONE, and well worth my 20 bucks. I can't imagine that the ES would be too different, but I know that my car's vibration is easily disregarded. My Mom could drive it, and not think twice about it.
I reiterate...
If your car is vibrating THAT badly, something needs some attention besides the bushings.
BTW, I'm not making this personal, just expressing my observations on what I found to be a GREAT upgrade for little money.