Performance programming?

Benzadmiral

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Buick Ownership
2016 Buick LaCrosse 3.6 Premium
My new-to-me '16 LaCrosse Premium with the 3.6 is a great and smooth-handling car. But I wonder whether I could benefit, either in takeoff/passing performance or in gas mileage, with one of these: Security Check

A little pricey, yes, and the only site I've found reviews on it is this one. Is it merely snake oil?

I drive mostly in the city, though I do get a chance to make the car run from time to time. Would I see noticeable differences in the car's power and/or fuel mileage?
 
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