You have a MetroPlex? I bought the very last MK I. Took delivery in Dec of last year. It only took 2 years, but I completed the collection of all MK I & MK II models (MetroPlex, SuperPlex, GPM 45 and my desert isle DVL-1).
George is a multi-faceted person. Deep sense of humor, curiosity, will to experiment and document the 60s Marshalls. He created the first master volume that, instead of coloring the tone like the rest, it behaves akin to a stereo’s volume; you get the same sound regardless of the volume. The only factor that changes is the drive of the speakers. He included a lossless loop that is the industry standard (designed by George’s friend Steve Miller - not the Fly Like an Eagle guy). They are the only amp I found that allow the player to stand in front of a 4x12 cranked to soak it all in. He obsessed with circuits that sound and react identically to his 1960s amps. As @greatmutah2112 can attest, switching back and forth between his and the original is undetectable.
I believe he has a dozen or so pre-orders to fulfill and then he’s out. Those lucky people will find it worth the wait. As George said “Once you hear it, you’ll never unhear it.”
I wish him the very best and still believe he will be back in, at least, a circuit designer position. You can’t turn off that level of curiosity and genius.