[diesel]

I've never noticed any issues with downshifting on mine. In fact, I think it is too eager to downshift as it's not really necessary with all the torque available down low from the diesel. I would say that there's 1/2 second lag at most while turbo spools up. I've not had any issues with drivability. I do notice firm downshifts as I am coasting to a stop. No doubt a characteristic.