Hi Bob.
Those Cast Iron Wash Arms (aka Big Blue) have a tremendous coverage pattern. My KD2 actually wiggles with all that water being thrown around but is amazingly quiet.
Racking is everything in a One Armed Wonder. This machine cleans Very Well considering it has only One Main Wash followed by a 30 sec. Rinse and then a 1 minute rinse.
KitchenAids before the 18 series were and are truly Dishwashers. Yes, you could scoot a few pots and pans in the upper rack if you have room, but cooking for one or two, I like to throw everything in and "Git er done".