I think the authors point was to suggest that Atwood's keyboard is no better than existing models, which can be had for much, much less $$$
He didn't really go into that though. He looked at features, not materials or build quality, which are both major factors in mechanical keyboards. I can tell you first-hand that the materials that Logitech, Cooler Master, and Corsair use on those particular keyboards don't compare to anything that WASD uses; the K60 isn't even completely mechanical! Those are all "budget" mechanical keyboards. The Filco is more comparable, but at the same price and without backlighting or MX Clears.
They keys are a bit nicer on the Filco and there are also more mods and replacement parts available for it (yay, aluminum bodies). The Filco PCBs are a bit better: "the through-holes for the switch pins has pads only on the top surface for CM, while Filco has pads that are on the top surface and goes all the way inside the holes. The trace/pads are less prone to being ripped out, but of course this probably only affects desoldering."
On top of that, Diatec (Filco) has great customer support and has been known to send their customers replacement parts long out of warranty.
Other than the stabilizer, they're almost the same keyboard by the same designer. :B
The partnership with WASD Keyboards actually makes this board cheaper than it would have been otherwise.