It's quick, but not as quick as they claim based on the video. Honestly, it shifts only a tad faster than the ZF 8 speed in BMW's. GM is claiming that this transmission shifts faster than the PDK. Look at any video demonstrating the shift speed of a PDK whether it's from some car review from Chris harris or a video showing the rpm gauge and speedometer. The PDK shifts quicker and it's definitely more crisp. Have a look on YouTube.