Bought the SCT X4 flash w/ 5-Star tuning, and Banks intake for our 2016 Miramar.
It has been a nice, albeit nuanced improvement over the OEM 6-speed mapping.
On cruse control the OEM would quickly drop two gears on a slight hill. The 5-star will hold longer, drop one gear, then hold before dropping again if needed.
Downshifting in tow is a little more aggressive with the 5-star.
All in all, the 5-star enhances drivability. If you pay attention to what the engine/trans is doing, then it is worth the price IMO. If you are a casual driver, go for interior upgrades instead.
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