I have owned both N/A & SRT auto's & found the tip on the N/A very slow change to the point of not really worth using it, I can remember having to predict the change about 1000 rpm early to allow for the delay.
In comparison the SRT box is much sportier & a total joy to use & I personally would not want anything else but again in tip mode although faster than the N/A I still cannot get to grips with it as well as leaving it in auto mode. If you prefer the manual input of gearbox driving by all means give one a test drive for sure.