Look closely guys and girls and you'll see a "Clark Pump" like
Spectra has been using forever to get high
power efficiency from their watermakers.
Either Spectra's patent has expired (quite possible at this point), or these guys are leeches.
Either way, it is a copy-cat from the Spectra design.
Spectra has mostly moved into the high end, automated, bells and whistles market, so there might be a place for someone making a bare-bones Clark Pump RO system.
With this system, I would seriously evaluate the long term availability of parts and technical support before I pulled the trigger.