Hee-hee! I've had a go with one. Na,na,na-na,na!
A superb bit of kit for the kinds of work shown there. One pump will support two vac vices for heavier doors.
Not only that, but several other manufacturers are coming out with remarkably similar kit. I saw several at the Nuremberg show a couple of months ago. I reckon by this time next year you won't be able to move for vacuum vices.
S