From what I understand the US adopted the VFB concept and ran with it but relevant patents somehow ended up in the hands of China - who picked up that ball and ran even harder.
That has resulted in China now being the clear leader in implementing VFBs and possibly in product development too.
As far as getting one for one’s home, I’m hoping the mystery image of WA Premier and Graham standing in front of the shiny black Vsun box that was posted to Twitter the other day is the stage 2 residential prototype ( which may be going into commercial production for people like you.)
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