Royal Purple makes solid products. I had a harsh shift between 1-2 on my transmission and switching to their fluids smoothed it out so nice! Their injector cleaners are also the best I've ever used, I can actually document a change in idle smoothness where the other stuff (Lucas, Techron, etc.) I have no idea if they even work.

The question then becomes, are you receiving any benefit from running Royal Purple motor oil? That is a hard question to answer. Our engines don't burn oil, don't leak too bad and don't throw rods so there may not be much of a benefit other than reduced changing intervals and peace of mind. It's only roughly $15 more each oil change so perhaps that alone is worth the extra cost. I do have to say that their bearing load tests are very impressive though. The oil will actually polish and smooth the bearing surface, not scratch it!