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I thought it was worth the money. So much smoother on the transmission shifts. Returned from a 5000 mile trip and I'm glad we had the 5-Star Tune. No more rpm changes from 2200 to 4500. No more hard shifts.
Wouldn't hesitate to buy it again. Big difference with cruise on flatter terrain. Pulling grades as well as merging into traffic it is much smoother. I also understand that they are working on an upgrade for cruise when pulling grades.