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All drivers are different in the way they control the vehicle and transmission, so you're not going to get a blanket "it's better".
I'm fairly aggressive in throttle and transmission changes, so for me, I noticed an improvement straight away in converter lock-up, with increased response and less muddy feel on shift. I'm about to run the customisation module to adjust all the shift points, and have requested xHP look into a function where the TCU won't auto-shift within a set period of time after a manual change in auto mode.
Is it going to make your car quicker? Perhaps marginally.
Will it make your driving experience better? Potentially, depending on how you drive and tweak it accordingly.
It's not designed to be a "gives you xxx HP gain" type modification, merely giving you greater control over your TCU, and unless you're a tinkerer, you're not really going to get the full benefit from the flash.
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