Hi rsun,
japp did it today had a Gopro on the center plate of the S800 and yes there were a bunch of vibs that could be seen on the cam. I didn't balance anything yet since i am just to lazy these days. I am not really concerned though to tell the truth. Essential for me will be the S800 zenmuse combo. But one thing is for sure vibration isolation when using anything else than the zenmuse as a gimbal ( were i guess the vibration isolation will be included in its mounting construction) will be something that has to be done wisely with any of the other given Camera Gimbals.
Boris