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Nowadays modern AT's are smart enough to hold gears as required during high G situations, most of them are programmed to 'learn' how the driver drives and adjust the gear changes accordingly. In the proper drive mode they hold gears...im not sure how long cuz I think it may think it needs to change after a certain amount of time though.
The ISF's 8 speed tranny i think was the first typical automatic transmission to succeed with such a characteristic. And being a Toyota product it eventually trickled down to the rest of the Toyota family (where applicable)
In any case the auto tranny in the twins is programmed really well. The most important thing IMO is actually the response time, not the shift time or the gear holding, and it really succeeds in this regard. I remember test driving an AT and flicking the paddles results in near instant response to gear changes. The car did need to be pushed to exhibit this as slower/cruising driving slowed the response and there would be a delay.
My X1 is the same way, the ZF 8 speed is pretty responsive. The only problem I have with it is that 8 speeds is too many for paddles. I actually don't find it all that much fun when I have to flick the paddle like 4 times to get into a gear I want...and even then I might get confused at what gear im in lol.
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