Just like most other things,
I think you get what you pay for, up to a point. My landlord, never a generous man, has a literally no-name commode in this bathroom. No idea if it is Eljer, American-Standard, Kohler, Toto, Universal-Rundle.....
It is terrible. The water does NOT fully exchange. I have done everything I know how to do....I've scrubbed under the rim with a brush, hoping to get all the jets functioning......
At least once a month I have to plunge or pour a gallon bouquet of water into it, and I wish I could say it has never overflowed. I wish.
I don't care if vacuum assisted commodes are noisy, they are effective! If you're worried about waking someone else at night, just flush #2.
My dream commode is a vacuum assisted one at ADA height.
My dream bath has a separate urinal, as well.
Lawrence/Maytagbear