anybody running this differential

They are nothing like a cone type unit as they have no sacrificial wear surfaces and no metal to get run through the bearings and gears.
They are more money - but as I said - I've done new and refurbished clutch types, I've done brand new cone types, I won't rebuild a cone type. They all will wear out, some very quickly if the car's heavy or you do a lot of hard cornering like parking lot racing or road racing.
The Tru Trac simply keeps going. I've thrown a dyno'd 600hp with very wide Nitto 555s at it - no problems. Even pulling 1.2Gs on the skidpad. So if someone needs a sure grip - it's the tru Trac or I don't bother.