Nice! I'm sure it'll serve you well. You'll definitely love the way your car powers out of corners, pushes through poor traction scenarios, and accelerates straight as an arrow. I can't really speak to Mfactory having copied anyone's design per se, considering the history of differential development, so here's what I know:
Now, for the record and for whatever it's worth, I work in automotive benchmarking (engineering/design/production, not dyno power figure stuff) and am currently studying to become a mechanical engineer. I'm constantly exposed to a wealth of information about automotive history, design, the hows and whys of it all, and get to tear into current models from a variety of manufacturers in great detail*. Doesn't make me an expert, by far, but anyways...
Quaife did not invent the helical/geared limited-slip differential, although they do have a European patent for their specific design which they call "Automatic Torque Biasing" or ATB and have been very successful at becoming the "name brand" in the market, akin to how everyone would call tissues "Kleenex." Vernon Gleasman invented the original geared LSD around 1949, which he called the Torsen Torque-Sensing differential. This is the design that all geared limited slip differentials can trace their roots to. The original "T-1" design could be found in a number of vehicles, including older Audi Quattros, Subaru Imprezas, and the US Army's own Humvee. There are many varieties of the Torsen LSD depending on the requirements of usage scenarios, and different revisions (T-2, T-3) that use different gear types. Varieties of the Torsen can also be found in some Toyota Supras, the Chevy Trailblazer SS, and others. Torsen LSDs are, to my knowledge, OEM equipment only. Quaife stormed the aftermarket, and so is more widely known.