I also like it, and many of my friends swear by it.
Seems to quiet things down a bit.
I filled the rear hubs with straight Lucas additive on a 55 COE truck. The rear axle had water in it, and marginal to poor hub bearings, I did inspect and clean them first. They survived the tow from WA to NY, at times over 70 mph, and the hubs always stayed cool to the touch.
Grigg