The 1087XM is one of the lowest quality boards I've ever tried. With the Filco Zero, you get everything good about the Filco (good case, PCB, plate, ability to put an HID liberator in it, Modern TKL layout) and the ability to swap it to say Salmon, Cream, or Matias Clicky Alps. *That's* why I want one. Not because it's rare.
I bought a 1087XM because I couldn't find a Zero. Everything but the PCB was garbage and the PCB was so-so.