My reviews of Flash Pro:
I'm happy with the flash pro and tuning. The changes are night and day!!! My car feels extremely responsive, It's taking me a few days to get used to my car, as it feels like I'm driving a new one
Flash Pro and tuning DRASTICALLY modifies the way the engine handles ignition retard from throttle tip in, so you get WAY more torque at partial throttle and the car will just easily get to speed without having to floor it.
I'm learning that it's very normal for it to feel way different. You'll also notice more sensitive throttle response, MUCH faster rev drop and it might be hard to get used to how fast it drops between gears.