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As ComboJohn says the heavy racks were very well designed and the extra roller and axel on the upper rack allow it to hold a ton.
The older induction motors draw 5.5 amps and move a TON of water. If you ever pull a tower wash DW out of the cabinet and take the sound insulation off, you will be surprised at the force of the water hitting the PermaTuf tub you can place your hand on the outside of the tub and feel the water jets strike the inside of the tub as they rotate and feel the surprisingly strong vibrations from the shear force.
Like ComboJohn, I have a love-hate relationship with the little saucer rack. It does keep you from putting a large pot in the back of the lower rack. On the other hand, it gets saucers out of the upper rack and gives you more room for bowels, etc
The PowerTower is designed to wash the upper rack 100 percent by itself. It is not there to augment the lower wash arm for cleaning the upper rack, but to give, as GE states, true random loading.
As long as the tower is not blocked or a tall pot is not in the way of its jet stream (this is probably the most common misloading mistake) it will clean every item in the upper rack, including the corners, with ease. A while back I mentioned the "dried up peanut butter in a jar" test.
The GE tower wash is the only DW I have had that CONSISTENTLY cleans dried on crud from inside of small mouth jars. Try it. Totally block the flow from the lower rack, you can then place the jar in any position, including any of the corners, and you will have a shiny clean jar when the cycle is done.
I have had dozens of GE tower wash machines (literally) over the past 30 years or so and they get my #1 rating for all around. Very, very close is the Maytag RR(which I love) and not too far behing that is the Whirlpool PowerClean.
No machine is perfect and each have their unique merits. The Maytag RR holds the most dishes and is easiest to load of any dishwasher I have used and can handle deep pots in the upper rack.
The Whirlpool PowerClean can handle and dispose of more food waste, and larger waste particles (like noodles, broccoli, green beans) than any machine I have ever had, without even breaking a sweat.
I am always changing out dishwashers to test them in the kitchen, but the one I always come back to for the permanent daily driver is the GE Tower Wash.