There's a toilet I use a lot where I work that's cool. For one thing, someone outfitted the tank with a sort of minitank, so when you flush, it only uses half the water. Kudos.
Something else I've noticed is that the construction of the bowl is such that whatever solids are in there, when you flush, it seems to just crush them. In most toilets I know, if you took a solid stool and flushed it, it would stay in tact and swirl away. Who knows what happens from there. But in this one, and I've got a pretty good sample size of turds deposited there, covering a range of hardness, particle size, etc., uniformly, they all seem to turn into a cloudy powder, solid stool pulverized and sucked down the pipe. It's a little disconcerting, a little beautiful. It's like the comedian Gallagher maybe. I strongly recommend pooping in this toilet and then watching the results. You'll be humbled by simple but strong engineering. Maybe it has to do with the small amount of water in tank, it's hard to say.