I've yet to find any good videos of a true KitchenAid, probably because their hayday was before easy mobile cameras and YouTube, but this is the next best thing. I love the way this guy speaks! But yes, in this video (the second one is actual agitation, the first is explanation) you'll see how well the larger KA agitator rolls a comforter over on the motor's medium speed, which was the "high speed agitation" speed on a real KA.
He switches it to the 180 opm "fast" setting for a few seconds, which you can see is just ridiculous, but like he said, that would put some pretty bad wear on the components if used regularly with normal sized loads. The comments on the video below saying to "keep it at fast speed, it will cause NO wear" had me chuckling. You have fun with that, kid, and you'll have a very short lived DD on your hands, lol.