KitchenAids are great dishwashers. Hobart told everyone that KitchenAid dishwashers were made by the people who made dishwashers for restaurants, hospitals and other institutional operations. That's great, but the applications are not the same and much of the time, KitchenAids were not cutting edge, just like Maytag washers and dryers were not cutting edge. KitchenAid dishwashers would last almost forever in the 14 and earlier series, but they were late in adding detergent dispensers and the prewash that required a detergent dispenser. Their tanks before the 15 series were small. Yes they could blast fresh soil off dishes, but home machines are not in constant use and don't stay hot and it was not until the 15 series that you had two water changes to heat up the machine and the dishes before the main wash so that they got a good, hot wash. The other thing about commercial kitchens is that they scrap the dishes pretty thoroughly and, unless the dishwasher has a pre rinse tank, they rinse most of the food off the dishes before sending them through because it saves detergent. Commercial dishwashers also have booster heaters to keep the wash water hot and Hobart did not see fit to include an element to heat the water until way late in the game, just like the wash arm under the top rack. Whirlpool and even D&M had it for years before KitchenAid. The size of the loads and the washing ability of our Mobile Maid with the bow tie impeller was far greater than what I experienced with my beautiful 14 Superba VariCycle. They were contemporaries. And the bowls and pans that could go into the GE along with dishes could not fit in the 14 and allow room for all of the dishes we loaded into the GE. We used and loved our 15 from 67 til we sold the place in 2003. It might still be there. I love my two 18 Superbas, BUT, I have had super clean dishes and pans come out of the 1965 era Westinghouse machines with the single wash arm, spray spinner in the middle of the lower rack and the square filter. I don't think anything cleans better than my WP-built Kenmore Ultra Wash. It does not have the capacity of the 18 series KitchenAids, but it really cleans. It's a hell of a lot better dishwasher than the 21 and 22 series electronic Superbas I had with that stupid water heating and the one rinse and, unlike those machines, the upper rack rails in the Ultra Wash are not rusting, nor are they in the 18s. All the KitchenAids after they removed the constant rinse could leave, what do you call them "yibblets?" on things in the top rack. That's just not great dishwashing. It's a shame how things go to hell. It's an even greater shame that it took KitchenAid so long to produce the apotheosis that was the 18 and to produce it for such a short time before beginning the descent into energy saving insanity.