I was surprised when I installed it. Vibration at idling is significantly reduced. It's also more stable on the highway and less wobbly in crosswinds. (This is to a certain extent, but …) I am now able to ride much more stably when passing through the grooves that are sometimes found in mountain passes.
However, if you think that vibration is the flavor of SR400, you may be missing something.
It was not difficult to install, but I had a hard time removing the Bolt and Nut that were originally attached to the car body because they were so hard. I think it's better to ask a store for help. (Isn't it possible that the installation time is set to be short so that the labor cost is also low?)