PlaRail DX?

Have you guys seen the PlaRail DX models out there?  I stumbled across some on eBay when I was searching for the Kato version of the "Twilight Express" and up popped these DX versions of the PlaRail "Twilight Express".  It seems the main difference is that there are 6 cars instead of the more normal PlaRail 3 cars.  Not sure if there are any other differences, but just curious what you guys think of those releases?