Originally Posted by nicknaz
The DCT in the Z4 is lazy on downshifts (particularly when in a corner), even in sport+ / manual mode (compared to other dual clutch gearboxes like Porsche PDK). I agree with other posters that the M gearbox has much better software for sport driving.
I found myself annoyed by this just this week. It had been several days since I had it out and the damn thing wanted to cling to the higher gears. Even after I switched to the paddles it still seemed to take every chance it could to upshift (after not touching it for some amount of time, etc.)