yes...it is good..maybe not as good as they claimed but horsepower TV did a show where they took a camaro and swap all the fluid with the royal purple equivlant and they got a 7 Wheel horsepower gain.
^I agree, everytime I change my oil ( I use Castrol GTX) I feel it runs a tad better for about a day or so, then it's back to normal. I love driving after an oil change.