The trans go kit certainly causes a quicker, more abrupt shift. But this is dependent on throttle input.
In high range, the firm shifts are great for acceleration and merging with traffic. But can feel harsh at slower speeds and in stop-and-go conditions.
In low range, the trans go can be a little harsh at times. Up shifting from first to second can cause the tires to “chirp” a little, but if you decrease the throttle input during the shift, the gear change is more subtle.
It took me a little while to figure out how to best manage the firmer shifts, but not long.
Downshifting didn’t seem significantly different than stock.
Overall the truck was still very driveable, and it feels like the transmission is more efficient.