I have sold thousands of TOTO products. And to be clear, I sell and install all brands. I see everything. TOTO is a very good product, I don't care what a review site out of Banglladesh, Africa, Philippines or India thinks when they sit behind a screen having never seen the products they recommend while getting an
Amazon cut for the sale.
Quality control on TOTO is very good. I sold six Ultramax II's this week. I have one in my home. Most sales are repeat.
That being said, the person above that thinks they have a defective Kohler may need to pull the bowl and work from the bottom side before quitting on it. We find all kinds of things that were never flushed, but did go missing in the household. I don't care what brand it is, they won't flush phones, army men, toy cars, make up pens, Q-Tips, forks, tennis balls, potatoes.