John Koeller of MaP bought a Caroma rated at 550 grams for his home.
He then commented that the bowl does not stay clean.
You will never plug a Caroma, but that doesn't mean the bowls are clean.
The MaP testing doesn't not tell you if it's a "good" toilet.
It does tell you that it will flush soy paste wrapped in plastic that is 3/4" in diameter and about 4" long.
What we try to do with our information, is to also consider:
How well the bowl rinses.
Quality control, does the plumber have to return bowls or tanks until he gets a complete working toilet?
Can you get after market parts for it? Parts for for Aquia
Is the flush startling or annoying?
Does the flush valve start leaking after a short period of time?
Homeowners and plumbers help to write this report.
The "only" report that uses homeowner input.
Quality Control for Toto is very good. No, make that excellent.
On the difference between the Aquia CST414M with the 2-5/8" trapway and the Aquia CST416M with the 2-1/8" trapway, they work very much the same. The odds of anyone noticing a difference is slim.
In the Seattle area, we are mainly stocking the enclosed bowl CST416M with the 500 Gram rating. The sound levels on this bowl are a little nicer. You can say that the homeowners have voted, and they seemed to have chosen the enclosed Aquia II bowl over the old style.
Either of the Eco Drake bowls would be fine. The only real difference between the elongated and the regular bowl, is the extra 1-1/2" at the top of the bowl for needed space. The lower part of both bowls are the same. If one is rated higher than the other, I don't know why. The ADA version of the same bowl is rated at 900 grams, using the same tank and trapway.
Either way, I have used the Aquia dual flush, the EcoDrake 1.28, and Gwyneth 1.28 in my home. They all work very well.