No it's not....

Have you done any research on this piece of s!@#

Thats what many people reckon of it.

To fir the phantom grip (PG) one needs to machine the gears inside the diff. The gears come case hardened, by machining the gears, they are no longer hard.
Also the PG works like a plate LSD in that there are friction surfaces. In the PG's case, its the PG block and the diff gears......which are no longer hard.
So...one wears out the diff gears quick smart.

I once heard a saying.. went something like..
"if it's to good to be true..." damn, can't remember the rest of it.