Just had a chance to watch the video, and saw that some water is sent through the overflow drain to keep the trap primed.
How does one keep the overflow ports and the area beyond them clean? I would think that on bad days there there are "explosions", that area could become filthy, unsightly, smelly, you name it. We all know how the overflow on a lavatory can get dirty fast. I would think the overflow on this toilet would have even more of an opportunity to become fouled, and that cleaning it would be unpleasant added extra work that might be neglected if it can be done at all.
I will stick with my two Toto Drakes (by the way, 5.5 years with the 1.6 and 8 months with the 1.28; no complaints with either).