Jannd Lowrider
I know you can't believe manufacturer's stats, but according to Jandd, their lowrider is almost twice the weight (~400 g more) of the OMM and Hebie racks. I believe it's made with solid aluminum rod instead of hollow tubing. Compared to those monster racks with a shelf on top, it's definitely lighter, but compared to the Tubus Duo, it looks like a sledge hammer to a claw.
If the Hebie's mount points really are those little tab things, it's hard to believe it can be as sturdy and stable as they suggest. Nobody has seen one of these before?