All three are Vortex. I'd love an MKC aluminum case but there are 6-7 IIRC so I don't think I should hold my breath on one of those. I wanted to jump on the Originative buy since I liked that design but I was in between employment at the time and didn't need/couldn't justify another keyboard, I may have to get one of those if they ever show up used just to be thorough
I need winkey for work and my home pc uses windows 8 so my Korean metal keyboard options are slim (KMAC 1/2 winkey, LZ-S like Sifo's, etc) and these satisfy my metal sweet tooth more than enough. Still may get a KMAC or something and reanodize it black just for the hell of it, but functionally I don't expect a custom keyboard to be any more practical for me than a Filco and the case is more than enough to beef it up.
The Filco ping is extinct, I think that the way the Vortex case holds the PCB/Plate by sandwiching the bent edges of a stock Filco plate is superior to using standoffs, despite what Ripster had once said. There's no pressure applied to the PCB as it is basically floating inside the case suspended by the bottom of the switches and using the plate as the anchor point is the sturdiest thing I can think of, I doubt you could flex the plate with any amount of typing pressure.
The nagging things that I miss/want in a different keyboard would be the ability to use off-centered Caps-Lock and to have an LED on the Escape and Scroll Lock keys to light up a few of my novelty keys, but the difference in price between a used Vortex Filco and a KMAC is pretty hard to justify for those just features. I have a brown switch, bought a blue switch since it was my first switch type and I love it for long duration typing, and now have gotten a second brown switch for work. I spend the rest of the money on thick PBT sets and other overpriced keys, so I'm pretty happy with my overall keyboard stable
tl;dr - Voted with my wallet, I really like the feel of a Filco in the case and think it's a worthwhile upgrade so I bought three
