Stillpoints Ultra 5 versus Vibraplane


Anyone have direct experience with Stillpoints Ultra 5 or Ultra SS versus newest version Vibraplane 2212-02 which is 20“ X 24“ platform and active.

The two Vibraplane I currently use are at system front end (source), Studer and turntable.

Seems amps would be less improvement than source but the question comes to mind because in my case the amps are just inches away from large speakers. The floor is very solid but there has to be incredible energy going into the floor and acoustical energy into the surrounding area.
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Anyone now using a Vibraplane under their amplifiers, having come from any other isolation system?
There is a guy in WBF that used an active Vibraplane under his TT and amps. Not sure if he posts here