I always wondered how a G80 worked. Seems like a horrible compromise with terrible characteristics that get worse exactly at the worse time. I would rather have a helical LSD diff or a lunchbox locker in a second.
I don't care for the Gov-Lock, and I think we've covered why. Other clutch-type LSD units have similar challenges.
Nothing wrong with a worm-drive diff like the Quaife, especially for a road car.
But for off-road driving, and especially for the types of off-road driving that we are likely to do, I would prefer a ratcheting diff like the Detroit Locker, or any of the drop-in units like the one you mentioned, for the REAR drive axle. They're simple, strong, they 100% work all the time (even if one wheel is off the ground), and they don't break parts like the Gov-Lock does.