"Dual-disc" Maytag vs. Calypso
I have both a Neptune TL ("dual-disc" Maytag) and a Calypso. The Calypso has been my daily-driver for almost 9 years and I find it to be superior of the two in several respects.
Calypso rinses better.
There's no way for anything to come out of a Calypso without having been thoroughly doused with detergent & rinse solution and mechanically tossed
Neptune TLs are interesting for sure but have a trouble with being unable to consistently roll loads of light-weight fabrics and some types of bulky loads. Of course the typical consumer would have no clue of this problem due to inability to see through the locking lid. I've washed LARGE loads of typical cotton/synthetic casual "button-down" shirts that did not roll over even once through the entire wash period without my help. I watched from the start and let it go through the full wash period to see if *maybe* it'd eventually roll ... but no. The disc could not get sufficient grip on the load to roll it. I restarted the cycle and helped it along. Some loads may roll a few times then get "stuck" for some minutes and either not roll any further, or eventually start rolling again. Two days ago I ran a small fleece/microfiber blanket and a black cotton t-shirt. Warm water. I didn't watch the load from start but I checked it toward end of the wash period. The items were jiggling between the discs, not rolling at all, and there was a blob of undissolved STPP caught in the blanket. This would not have happened in the Calypso.
The Calypso has *never* gone off-balance during spin. The Neptune TL often has trouble balancing/distributing. It aborts after four tries on the before-rinse spins and does a long drain instead. It refills and tumbles after four failed attempts on the final spin, does that twice if necessary, then beeps for help. The final spin is limited to 500 RPM if the tub impacts the cabinet during any distribution attempt. Terrible tangling of some types of loads impairs separation of the items during distribution attempts which contributes to balancing trouble. The Calypso's center dome avoids this problem.
I have had items damaged in the Neptune TL. Never in the Calypso.
Reference this video of a bulky-items load getting "stuck" in a Neptune TL (from 0:14 to 3:03). I have seen instances of a load getting stuck after several rolls and not "breaking-free" to roll more.