In the plus six I always feel there is so much power that you are not in control, rather you are just on the edge.
The plus four is more balanced & is very powerful but you feel more in control.
The autobox has 8 gears and the change is seamless, so you press the pedal and pow! It is nearly always in the powerband.
The manual has six gears but they are very long. 70 mph is easy in second . But to get the umph you need the turbos on song. So that implies regular gear changes.