I have no doubt that you have sold many Guinivere's as that is what you do. And I was not putting all the blame on the Guenevere. I'm talking about Toto's in places I have installed them, all of different makes and ages. And as a matter of the not flushing, it was her loose stools that wouldn't flush clean for this particular lady. As I was replacing her low Toto Ultra Max toilets with the Guenevere, I had a very good testing method. Her original old Ultra Max and the replacement new Ultra Max without the floor kit both worked just fine. I also gave my sister both Guinevere's and installed them in her house, after I spent some time sanding down the rough edges inside the floor kit so it would flow as perfectly as possible, they both seem to work fine.My real issue is with the kit, and the fact they squeeze a round circle into an oval. Now not being a fluid mechanical engineer, I can't say for certain that constraining a round pipe by squeezing it instead of forming it into a full circular trap, but as far as I'm concerned it does constrain and limit the 3" initial toilet opening to some degree. As far as flushing, try missing a full flush(slipping your hand off the lever) with a Toto and then re flush it again, and see if you can't get it to stop up. I've done that myself hurriedly several times with my Toto's. I know you like, and promote, the Toto products, and saying I no longer love Toto's is somewhat blasphemous. Even though I no longer love them, I have installed and recommended them to all my family and friends houses. I only have Toto. But as a retired General Contractor, I used to just buy what everybody said was the best, or at least what my budget and plumber had in mind. As a consumer, I now have the advantage to make judgements based on my own personal experience. I learned many years ago why men's urinals look like a pee storm when I was active in Gen Contracting. All my contractor friends wanted to be preppy, so all of us wore Polo shirts khacki shorts and Topsiders - I guess to show we really were gentlemen contractors. The first time I peed in a urinal wearing shorts, I realized it wasn't guys with bad aim that peed on the floor, it was blowback and splatter of our own urine. So aim all you want boys, you are still going to have urine on your pants or legs whenever you use a urinal. I still wear shorts as much of the year as possible, and have used every conceivable type of urinal. They all spatter back on you. It sort of creeps me out, but when you gotta go...That being said, I think urinals are poorly designed based on personal observation. Same with toilet seats. As I am now somewhat of a sculpture, I am going to re make a Toto Seat so that it fits comfortably. Geeze, I was just wondering if anyone on the whole internet world had experience with comfortable toilet seats that were ergonomically correct. And yes my mom did teach me how to aim. That being said, I will continue my own lonely research, and as Jimmy Valvano once said" never ever give up" Thanks for your input, and Ciao